[monitored barrier] Slight logging enhancement (#72754)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72754
Log to clarify that this msg is coming from rank 0
ghstack-source-id: 149109294
Test Plan: CI
Reviewed By: H-Huang
Differential Revision: D34188480
fbshipit-source-id: 38d772392148b0dba97b619f8c8dbef1daf86008
(cherry picked from commit 00e2d3e44bd8ccf578693edb1689c3b694ac11e1)
