Missing documentation

The following is the list of files in the Documentation directory that have *NO* useful text in them at all.

git-build-rev-cache.txt
git-checkout-script.txt
git-diff-script.txt
git-format-patch-script.txt
git-get-tar-commit-id.txt
git-reset-script.txt
git-rev-parse.txt
git-show-rev-cache.txt
gitk.txt

The list is the output of the following trivial script:

cd Documentation
grep -l 'Does something not yet documented.' *

If you are the/an author of one or more of these commands (or anyone else), please create some documentation for it.

If you care to, please review the rest of the documentation for out of date and/or incomplete text and either produce a patch or let Junio know so it can be added to the TODO list.