Change a comment in pten header to avoid the disturb to op benchmark ci. (#38165)

test=document_fix

paddle/pten/kernels/hybird/cpu/elementwise.h

@@ -130,16 +130,15 @@ void CommonElementwiseBroadcastForward(
                                                  is_xsize_larger);
 }
 
-// It is a common implementation to compute binary calculation with the support
-// of broadcast, supporting both CPU and GPU.
-// - CPU implementation cannot support the case when x needs broadcast, thus
+// It is a common CPU implementation to compute binary calculation with the
+// support of broadcast. Note:
+// 1. CPU implementation cannot support the case when x needs broadcast, thus
 //    this function need to be called with XxxFunctor and XxxInverseFunctor,
-//   like paddle/fluid/operators/elementwise/elementwise_add_op.h#L49 - L55.
-// - GPU implementation supports all the broadcast cases, thus there is no need
-//   to define and call with XxxInverseFunctor.
+//    like AddFunctor and InverseAddFunctor.
+// 2. The corresponding GPU implementation supports all the broadcast cases,
+//    thus there is no need to define and call with XxxInverseFunctor.
 // TODO(liuyiqun): optimize the CPU implementation to support all broadcast
 // cases and avoid the need of XxxInverseFunctor.
-
 template <typename Functor, typename T, typename OutType = T>
 void ElementwiseCompute(const paddle::platform::CPUDeviceContext &dev_ctx,
                         const DenseTensor &x,