Document that `remainder` does not support complex inputs (#48024)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/34266
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48024
Reviewed By: ngimel
Differential Revision: D25028700
Pulled By: mruberry
fbshipit-source-id: 6d88c7d0930283455deb51d70708cc4919eeca55
