Editing How-to: Maintenance Announcement

Example markdown text for a maintenance announcement in our Matrix chat room [https://matrix.to/#/#general:pub.solar #general:pub.solar].

The source of the <code>version change</code> information is usually a Pull Request in our [https://git.pub.solar/pub-solar/infra git infra repo]. The <code>affected pub.solar services</code> should be added / removed as required. Also make sure to adjust the <code>start date and time</code> of the maintenance as necessary.
 📢 **Maintenance announcement**
 
 **Subject:** Short maintenance for security updates:
 
 ```
 forgejo: 7.0.11 → 7.0.12
 matrix-synapse: 1.120.2 → 1.121.1
 nextcloud: 29.0.9 → 29.0.10
 ```
 
 Affected pub.solar services with short downtime:
 - Forgejo (Git) <nowiki>https://git.pub.solar</nowiki>
 - Matrix <nowiki>https://chat.pub.solar</nowiki>
 - Mastodon <nowiki>https://mastodon.pub.solar</nowiki>
 - Nextcloud <nowiki>https://cloud.pub.solar</nowiki>
 
 Starting now.
 
 Check our [status page](<nowiki>https://stats.uptimerobot.com/G28ByiBg8j</nowiki>) for updates on service availability.
[[Category:How-To]]