Remove the statement that Established names are Grey

This is because pronoun colours override this colour, and it
has caused confusion.

Co-Authored-By: Kate Gregory <kategregory@users.noreply.github.com>

Author: claremacrae

discord/index.md

@@ -138,7 +138,7 @@ You may see some users with non-pronoun roles. This section explains them.
 
 ![A user with multiple permission roles](/images/discord_roles_multiple_levels.png)
 
-#### Established (Grey)
+#### Established
 
 From time to time, users who are active and participating are granted the Established role.