Add mastodon domains for menu item icons (twentytwenty, twenty-twenty-one) - #3778

Hi @ijoseph! 👋

Thank you for your contribution to WordPress! 💖

It looks like this is your first pull request to wordpress-develop. Here are a few things to be aware of that may help you out!

No one monitors this repository for new pull requests. Pull requests must be attached to a Trac ticket to be considered for inclusion in WordPress Core. To attach a pull request to a Trac ticket, please include the ticket's full URL in your pull request description.

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Thank you,
The WordPress Project

Committed in https://core.trac.wordpress.org/changeset/55061