fix a bug

paddle/operators/spp_op.cc

@@ -29,7 +29,7 @@ class SppOpMaker : public framework::OpProtoAndCheckerMaker {
               "(Tensor) The output tensor of spp operator."
               "N * M."
               "M = C * H * W");
-    AddAttr<int>("pyramid_height", "int", "multi level pooling");
+    AddAttr<int>("pyramid_height", "(int), multi level pooling");
     AddComment(R"DOC(
         "Does spatial pyramid pooling on the input image by taking the max,
         etc. within regions so that the result vector of different sized