Clean up markdown

There were some markdown processing errors which I've cleaned up

docs/Using-Mastodon/List-of-Mastodon-instances.md

@@ -2,17 +2,17 @@ List of Known Mastodon instances
 ==========================
 
 
-| Name        | Theme/Notes, if applicable           | Open Registrations  |
-| ------------- |:-------------:| -----:|
-| [mastodon.social](https://mastodon.social)      | Flagship, quick updates | $Yes |
-| [awoo.space](https://awoo.space)      | Intentionally moderated, only federates with mastodon.social | $Yes |
-| [social.tchncs.de](https://social.tchncs.de)      | Technology      |   $Yes |
-| [animalliberation.social](https://animalliberation.social) | Animal Rights      |    $Yes |
-| [socially.constructed.space](https://socially.constructed.space) | Single user      |    $No |
-| [epiktistes.com](https://epiktistes.com) | N/A      |    $Yes |
-| [toot.zone](https://toot.zone) | N/A      |    $Yes |
-| [on.vu](https://on.vu) | Appears defunct      |    $No |
-| [gay.crime.team](https://gay.crime.team) | N/A      |    $Yes(?) |
+| Name | Theme/Notes, if applicable | Open Registrations |
+| -------------|-------------|---|
+| [mastodon.social](https://mastodon.social) |Flagship, quick updates|Yes|
+| [awoo.space](https://awoo.space) |Intentionally moderated, only federates with mastodon.social|Yes|
+| [social.tchncs.de](https://social.tchncs.de)|N/A|Yes|
+| [animalliberation.social](https://animalliberation.social) |Animal Rights|Yes|
+| [socially.constructed.space](https://socially.constructed.space) |Single user|No|
+| [epiktistes.com](https://epiktistes.com) |N/A|Yes|
+| [toot.zone](https://toot.zone) |N/A|Yes|
+| [on.vu](https://on.vu) | Appears defunct|No|
+| [gay.crime.team](https://gay.crime.team) |N/A|Yes(?)|
 
 
 Let me know if you start running one so I can add it to the list! (Alternatively, add it yourself as a pull request).