[NNC] Add documentation for splitWith APIs (#58270)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/58270
Test Plan: Imported from OSS
Reviewed By: ZolotukhinM
Differential Revision: D28427226
Pulled By: navahgar
fbshipit-source-id: 39635e985095c7b581452464d7a515c6f86b24e8
