rename the auto parallel suffix (#35765)

paddle/fluid/framework/proto_desc.h

@@ -27,8 +27,8 @@ constexpr int kNoneProcessMeshIndex = -1;
 
 // If a attribute name has a certain suffix, it means that the
 // atrribute is a distributed-related attribute for auto parallel.
-// e.g., "mesh_id@PARALLEL".
-constexpr char kAutoParallelSuffix[] = "@PARALLEL";
+// e.g., "mesh_id@AUTO_PARALLEL".
+constexpr char kAutoParallelSuffix[] = "@AUTO_PARALLEL";
 
 }  // namespace framework
 }  // namespace paddle