info: Fix formatting of block comment

flake8 reports:

  E265 block comment should start with '# '

While we're at it, add a period at the end of the comment sentence.

Change-Id: Icb7119079a1d64e6defafc3f6d24e99dbf16139d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254596
Tested-by: David Pursehouse <dpursehouse@collab.net>
Reviewed-by: Mike Frysinger <vapier@google.com>