Clarify tweets for releases

Inactive Accountrequested to merge
winh-clarify-tweets into master

We will be deploying... and ...has been deployed on gitlab.com. tweets go to https://twitter.com/GitLabStatus, so !tweet has to be run in the #production channel.

...is released and ...is available tweets go to https://twitter.com/GitLab, so !tweet has to be run in the #releases channel.

Edited by Inactive Account

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