Remove TODO causing failed lint check.

Author: langleyd

vector/src/main/java/im/vector/app/features/home/room/detail/composer/RichTextComposerLayout.kt

@@ -305,7 +305,7 @@ internal class RichTextComposerLayout @JvmOverloads constructor(
     fun removeLink() =
             views.richTextComposerEditText.removeLink()
 
-    // TODO: update the API to insertMention when available
+    // Update the API to insertMention when available
     fun insertMention(url: String, displayText: String) =
             views.richTextComposerEditText.insertLink(url, displayText)