Fix formatting issue in setThreadSubscription.md

Author: setchy

docs/activity/setThreadSubscription.md

@@ -8,7 +8,7 @@ type: API method
 
 # Set a thread subscription
 
-If you are watching a repository, you receive notifications for all threads by default. Use this endpoint to ignore future notifications for threads until you comment on the thread or get an **@mention**.
+If you are watching a repository, you receive notifications for all threads by default. Use this endpoint to ignore future notifications for threads until you comment on the thread or get a **@mention**.
 
 You can also use this endpoint to subscribe to threads that you are currently not receiving notifications for or to subscribed to threads that you have previously ignored.