Re: [PATCH 3/3] git.txt: add list of guides

"Philippe Blain via GitGitGadget" [off-list ref] writes:

From: Philippe Blain <redacted>

Not all guides are mentioned in the 'git(1)' documentation,
which makes the missing ones somewhat hard to find.

Add a list of the guides to git(1).

Tweak `Documentation/cmd-list.perl` so that it also generates
a file `cmds-guide.txt` which gets included in git.txt.

Who cleans this?  Do we need a change to Makefile?