There is no man page for "git lfs post-commit" hook

**Describe the bug**
There are man pages for all hooks except the "post-commit" one:
https://github.com/git-lfs/git-lfs/tree/master/docs/man

**To Reproduce**
n/a

**Expected behavior**
There is a man page for "post-commit" hook so people can understand what it does.

**System environment**
n/a

**Output of `git lfs env`**
n/a

**Additional context**
n/a