fix a typo

paddle/operators/reshape_op.cc

@@ -67,7 +67,7 @@ Given a 2-D tensor X with 2 rows and 2 columns
 
     [[1, 2], [3, 4]]
 
-with target shape = [1, 4], the reshape operator will tansform 
+with target shape = [1, 4], the reshape operator will transform 
 the tensor X into a 1-D tensor:
 
     [1, 2, 3, 4]