minor formatting stuff

_posts/2022/2022-01-14-mattermost-6-available.md

@@ -10,7 +10,7 @@ layout: blogpost
 categories:
   - news
 excerpt: >
-  Since January 14th, 2022, the Mattermost service in the Helmholtz Cloud
+  Since January 14<sup>th</sup>, 2022, the Mattermost service in the Helmholtz Cloud
   appears in new splendor equipped with two new main features.
   Mattermost now comes with channels, boards and playbooks integrated
   into one single application.
@@ -18,7 +18,7 @@ excerpt: >
 
 ## What's New
 
-Since January 14th, 2022, the
+Since January 14<sup>th</sup>, 2022, the
 [Mattermost service](https://mattermost.hzdr.de) in the
 [Helmholtz Cloud](https://cloud.helmholtz.de) appears
 in new splendor equipped with two new main features.
@@ -49,7 +49,7 @@ The most recent changes are now described in the Changelog.
 ## Try it Out
 
 Have you ever been annoyed by the unstructured views of the various topics
-in channels.
+in channels?
 Try out [Collapsed Reply Threads](https://hifis.net/doc/software/mattermost/getting-started/#collapsed-reply-threads)
 by activating it in your user settings.