update fleet doc

doc/fluid/api/fleet.rst

-==================
-paddle.distributed.fleet
-==================
+=================
+distributed.fleet
+=================
 
 ..  toctree::
     :maxdepth: 1
 
-    fleet/Fleet.rst
+    fleet/DatasetFactory.rst
     fleet/DistributedStrategy.rst
+    fleet/Fleet.rst
     fleet/PaddleCloudRoleMaker.rst
-    fleet/DatasetFactory.rst
     fleet/UserDefinedRoleMaker.rst
     fleet/UtilBase.rst

doc/fluid/api/paddle.rst

-=======================
-paddle
-=======================
+==================
+paddle.distributed
+==================
 
 ..  toctree::
-	:maxdepth: 1
+    :maxdepth: 1
 
-	paddle/abs.rst
-	paddle/acos.rst
-	paddle/add.rst
-	paddle/addcmul.rst
-	paddle/addmm.rst
-	paddle/allclose.rst
-	paddle/append_backward.rst
-	paddle/arange.rst
-	paddle/argmax.rst
-	paddle/argmin.rst
-	paddle/argsort.rst
-	paddle/asin.rst
-	paddle/atan.rst
-	paddle/bmm.rst
-	paddle/BuildStrategy.rst
-	paddle/cast.rst
-	paddle/ceil.rst
-	paddle/cholesky.rst
-	paddle/chunk.rst
-	paddle/clamp.rst
-	paddle/CompiledProgram.rst
-	paddle/concat.rst
-	paddle/cos.rst
-	paddle/CPUPlace.rst
-	paddle/create_global_var.rst
-	paddle/create_parameter.rst
-	paddle/create_tensor.rst
-	paddle/crop_tensor.rst
-	paddle/cross.rst
-	paddle/CUDAPinnedPlace.rst
-	paddle/CUDAPlace.rst
-	paddle/cumsum.rst
-	paddle/DataParallel.rst
-	paddle/default_main_program.rst
-	paddle/default_startup_program.rst
-	paddle/diag.rst
-	paddle/disable_imperative.rst
-	paddle/dist.rst
-	paddle/distribution.rst
-	paddle/div.rst
-	paddle/dot.rst
-	paddle/elementwise_add.rst
-	paddle/elementwise_div.rst
-	paddle/elementwise_floordiv.rst
-	paddle/elementwise_mod.rst
-	paddle/elementwise_mul.rst
-	paddle/elementwise_pow.rst
-	paddle/elementwise_sub.rst
-	paddle/elementwise_sum.rst
-	paddle/enable_imperative.rst
-	paddle/equal.rst
-	paddle/equal_all.rst
-	paddle/erf.rst
-	paddle/ExecutionStrategy.rst
-	paddle/Executor.rst
-	paddle/exp.rst
-	paddle/expand.rst
-	paddle/expand_as.rst
-	paddle/eye.rst
-	paddle/fill_constant.rst
-	paddle/flatten.rst
-	paddle/flip.rst
-	paddle/floor.rst
-	paddle/full.rst
-	paddle/full_like.rst
-	paddle/gather.rst
-	paddle/gather_nd.rst
-	paddle/global_scope.rst
-	paddle/gradients.rst
-	paddle/greater_equal.rst
-	paddle/greater_than.rst
-	paddle/has_inf.rst
-	paddle/has_nan.rst
-	paddle/in_imperative_mode.rst
-	paddle/increment.rst
-	paddle/index_sample.rst
-	paddle/index_select.rst
-	paddle/inverse.rst
-	paddle/is_empty.rst
-	paddle/isfinite.rst
-	paddle/kron.rst
-	paddle/less_equal.rst
-	paddle/less_than.rst
-	paddle/linspace.rst
-	paddle/load.rst
-	paddle/log.rst
-	paddle/log1p.rst
-	paddle/logical_and.rst
-	paddle/logical_not.rst
-	paddle/logical_or.rst
-	paddle/logical_xor.rst
-	paddle/logsumexp.rst
-	paddle/manual_seed.rst
-	paddle/masked_select.rst
-	paddle/matmul.rst
-	paddle/max.rst
-	paddle/maximum.rst
-	paddle/mean.rst
-	paddle/meshgrid.rst
-	paddle/min.rst
-	paddle/minimum.rst
-	paddle/mm.rst
-	paddle/mul.rst
-	paddle/multiplex.rst
-	paddle/name_scope.rst
-	paddle/nonzero.rst
-	paddle/norm.rst
-	paddle/not_equal.rst
-	paddle/ones.rst
-	paddle/ones_like.rst
-	paddle/numel.rst
-	paddle/ParallelExecutor.rst
-	paddle/ParamAttr.rst
-	paddle/pow.rst
-	paddle/Print.rst
-	paddle/Program.rst
-	paddle/program_guard.rst
-	paddle/py_func.rst
-	paddle/rand.rst
-	paddle/randint.rst
-	paddle/randn.rst
-	paddle/randperm.rst
-	paddle/rank.rst
-	paddle/reciprocal.rst
-	paddle/reduce_all.rst
-	paddle/reduce_any.rst
-	paddle/reduce_max.rst
-	paddle/reduce_mean.rst
-	paddle/reduce_min.rst
-	paddle/reduce_prod.rst
-	paddle/reduce_sum.rst
-	paddle/reshape.rst
-	paddle/reverse.rst
-	paddle/roll.rst
-	paddle/round.rst
-	paddle/rsqrt.rst
-	paddle/save.rst
-	paddle/scale.rst
-	paddle/scatter.rst
-	paddle/scatter_nd.rst
-	paddle/scatter_nd_add.rst
-	paddle/scope_guard.rst
-	paddle/shape.rst
-	paddle/shard_index.rst
-	paddle/shuffle.rst
-	paddle/sign.rst
-	paddle/sin.rst
-	paddle/slice.rst
-	paddle/sort.rst
-	paddle/split.rst
-	paddle/sqrt.rst
-	paddle/square.rst
-	paddle/squeeze.rst
-	paddle/stack.rst
-	paddle/stanh.rst
-	paddle/std.rst
-	paddle/strided_slice.rst
-	paddle/sum.rst
-	paddle/sums.rst
-	paddle/t.rst
-	paddle/tanh.rst
-	paddle/topk.rst
-	paddle/trace.rst
-	paddle/transpose.rst
-	paddle/tril.rst
-	paddle/triu.rst
-	paddle/unbind.rst
-	paddle/unique.rst
-	paddle/unique_with_counts.rst
-	paddle/unsqueeze.rst
-	paddle/unstack.rst
-	paddle/var.rst
-	paddle/Variable.rst
-	paddle/WeightNormParamAttr.rst
-	paddle/where.rst
-	paddle/zeros.rst
-	paddle/zeros_like.rst
+    paddle/abs.rst
+    paddle/acos.rst
+    paddle/add.rst
+    paddle/addcmul.rst
+    paddle/addmm.rst
+    paddle/allclose.rst
+    paddle/append_backward.rst
+    paddle/arange.rst
+    paddle/argmax.rst
+    paddle/argmin.rst
+    paddle/argsort.rst
+    paddle/asin.rst
+    paddle/atan.rst
+    paddle/bmm.rst
+    paddle/BuildStrategy.rst
+    paddle/cast.rst
+    paddle/ceil.rst
+    paddle/cholesky.rst
+    paddle/clamp.rst
+    paddle/CompiledProgram.rst
+    paddle/concat.rst
+    paddle/cos.rst
+    paddle/CPUPlace.rst
+    paddle/create_global_var.rst
+    paddle/create_parameter.rst
+    paddle/create_tensor.rst
+    paddle/crop_tensor.rst
+    paddle/cross.rst
+    paddle/CUDAPinnedPlace.rst
+    paddle/CUDAPlace.rst
+    paddle/cumsum.rst
+    paddle/DataParallel.rst
+    paddle/default_main_program.rst
+    paddle/default_startup_program.rst
+    paddle/diag.rst
+    paddle/disable_imperative.rst
+    paddle/distributed.rst
+    paddle/distribution.rst
+    paddle/div.rst
+    paddle/dot.rst
+    paddle/elementwise_add.rst
+    paddle/elementwise_div.rst
+    paddle/elementwise_floordiv.rst
+    paddle/elementwise_mod.rst
+    paddle/elementwise_mul.rst
+    paddle/elementwise_pow.rst
+    paddle/elementwise_sub.rst
+    paddle/elementwise_sum.rst
+    paddle/enable_imperative.rst
+    paddle/equal.rst
+    paddle/equal_all.rst
+    paddle/erf.rst
+    paddle/ExecutionStrategy.rst
+    paddle/Executor.rst
+    paddle/exp.rst
+    paddle/expand.rst
+    paddle/expand_as.rst
+    paddle/eye.rst
+    paddle/fill_constant.rst
+    paddle/flatten.rst
+    paddle/fleet.rst
+    paddle/flip.rst
+    paddle/floor.rst
+    paddle/full.rst
+    paddle/full_like.rst
+    paddle/gather.rst
+    paddle/gather_nd.rst
+    paddle/global_scope.rst
+    paddle/gradients.rst
+    paddle/greater_equal.rst
+    paddle/greater_than.rst
+    paddle/has_inf.rst
+    paddle/has_nan.rst
+    paddle/in_imperative_mode.rst
+    paddle/increment.rst
+    paddle/index_sample.rst
+    paddle/index_select.rst
+    paddle/inverse.rst
+    paddle/is_empty.rst
+    paddle/isfinite.rst
+    paddle/kron.rst
+    paddle/less_equal.rst
+    paddle/less_than.rst
+    paddle/linspace.rst
+    paddle/load.rst
+    paddle/log.rst
+    paddle/log1p.rst
+    paddle/logical_and.rst
+    paddle/logical_not.rst
+    paddle/logical_or.rst
+    paddle/logical_xor.rst
+    paddle/logsumexp.rst
+    paddle/manual_seed.rst
+    paddle/matmul.rst
+    paddle/max.rst
+    paddle/maximum.rst
+    paddle/mean.rst
+    paddle/meshgrid.rst
+    paddle/min.rst
+    paddle/minimum.rst
+    paddle/mm.rst
+    paddle/mul.rst
+    paddle/multiplex.rst
+    paddle/name_scope.rst
+    paddle/nonzero.rst
+    paddle/norm.rst
+    paddle/not_equal.rst
+    paddle/ones.rst
+    paddle/ones_like.rst
+    paddle/ParallelExecutor.rst
+    paddle/ParamAttr.rst
+    paddle/pow.rst
+    paddle/Print.rst
+    paddle/Program.rst
+    paddle/program_guard.rst
+    paddle/py_func.rst
+    paddle/rand.rst
+    paddle/randint.rst
+    paddle/randn.rst
+    paddle/randperm.rst
+    paddle/rank.rst
+    paddle/reciprocal.rst
+    paddle/reduce_all.rst
+    paddle/reduce_any.rst
+    paddle/reduce_max.rst
+    paddle/reduce_mean.rst
+    paddle/reduce_min.rst
+    paddle/reduce_prod.rst
+    paddle/reduce_sum.rst
+    paddle/reshape.rst
+    paddle/reverse.rst
+    paddle/roll.rst
+    paddle/round.rst
+    paddle/rsqrt.rst
+    paddle/save.rst
+    paddle/scale.rst
+    paddle/scatter.rst
+    paddle/scatter_nd.rst
+    paddle/scatter_nd_add.rst
+    paddle/scope_guard.rst
+    paddle/shape.rst
+    paddle/shard_index.rst
+    paddle/shuffle.rst
+    paddle/sign.rst
+    paddle/sin.rst
+    paddle/slice.rst
+    paddle/sort.rst
+    paddle/split.rst
+    paddle/sqrt.rst
+    paddle/square.rst
+    paddle/squeeze.rst
+    paddle/stack.rst
+    paddle/stanh.rst
+    paddle/std.rst
+    paddle/strided_slice.rst
+    paddle/sum.rst
+    paddle/sums.rst
+    paddle/t.rst
+    paddle/tanh.rst
+    paddle/topk.rst
+    paddle/trace.rst
+    paddle/transpose.rst
+    paddle/tril.rst
+    paddle/triu.rst
+    paddle/unbind.rst
+    paddle/unique.rst
+    paddle/unique_with_counts.rst
+    paddle/unsqueeze.rst
+    paddle/unstack.rst
+    paddle/var.rst
+    paddle/Variable.rst
+    paddle/WeightNormParamAttr.rst
+    paddle/where.rst
+    paddle/zeros.rst
+    paddle/zeros_like.rst