adding a note to the documentation of polar (#63259)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63259
Fix #52919
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D30342536
Pulled By: NivekT
fbshipit-source-id: 4c61a86f96a6370cc64652bf652c4ae25c9f4601
