myfirstcontrib: hint to find gitgitgadget allower

GitGitGadget, a handy tool for converting pull requests against Git into
Git-mailing-list-friendly-patch-emails, requires as anti-spam that all
new users be "/allow"ed by an existing user once before it will do
anything for that new user. While this tutorial explained that
mechanism, it did not give much hint on how to go about finding someone
to allow your new pull request. So, teach our new GitGitGadget user
where to look for someone who can add their name to the list.

The advice in this patch is based on the advice proposed for
GitGitGadget: https://github.com/gitgitgadget/gitgitgadget/pull/138

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/MyFirstContribution.txt b/Documentation/MyFirstContribution.txt
index 5ce94e0..b55837e 100644
--- a/Documentation/MyFirstContribution.txt
+++ b/Documentation/MyFirstContribution.txt
@@ -785,6 +785,14 @@
 but you will not be able to `/submit` your changes until someone allows you to
 use the tool.
 
+NOTE: You can typically find someone who can `/allow` you on GitGitGadget by
+either examining recent pull requests where someone has been granted `/allow`
+(https://github.com/gitgitgadget/git/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Aopen+%22%2Fallow%22[Search:
+is:pr is:open "/allow"]), in which case both the author and the person who
+granted the `/allow` can now `/allow` you, or by inquiring on the
+https://webchat.freenode.net/#git-devel[#git-devel] IRC channel on Freenode
+linking your pull request and asking for someone to `/allow` you.
+
 If the CI fails, you can update your changes with `git rebase -i` and push your
 branch again: