docs: Add note about nightly versions bump (#59324)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59324
Also updates section on pinning pytorch/builder with an example
[skip ci]
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Test Plan: Imported from OSS
Reviewed By: malfet
Differential Revision: D28840049
Pulled By: seemethere
fbshipit-source-id: e5d6722713680e969893d9df97ec269fc9c00411
