Merge branch 'ar/doc-libera-chat-in-my-first-contrib'

Update MyFirst document.

* ar/doc-libera-chat-in-my-first-contrib:
  MyFirstContribution: link #git-devel to Libera Chat

Documentation/MyFirstContribution.txt

@@ -47,7 +47,7 @@ Veteran contributors who are especially interested in helping mentor newcomers
 are present on the list. In order to avoid search indexers, group membership is
 required to view messages; anyone can join and no approval is required.
 
-==== https://webchat.freenode.net/#git-devel[#git-devel] on Freenode
+==== https://web.libera.chat/#git-devel[#git-devel] on Libera Chat
 
 This IRC channel is for conversations between Git contributors. If someone is
 currently online and knows the answer to your question, you can receive help
@@ -827,7 +827,7 @@ 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
+https://web.libera.chat/#git-devel[#git-devel] IRC channel on Libera Chat
 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