docs: add link to Tensor.share_memory_ in Module.share_memory (#52561)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/48228
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52561
Reviewed By: malfet
Differential Revision: D26626012
fbshipit-source-id: 7aab44c60d1bcbda68012521ec852843864abc7f
