Run a minor code quality checker over the repo (#8524)

* Run a minor code quality checker over the repo

Largely targeted at spelling of common words and misc code issues.

* Update snapshots

src/Rooms.ts

@@ -52,7 +52,7 @@ export function looksLikeDirectMessageRoom(room: Room, myUserId: string): boolea
         // Used to split rooms via tags
         const tagNames = Object.keys(room.tags);
         // Used for 1:1 direct chats
-        // Show 1:1 chats in seperate "Direct Messages" section as long as they haven't
+        // Show 1:1 chats in separate "Direct Messages" section as long as they haven't
         // been moved to a different tag section
         const totalMemberCount = room.currentState.getJoinedMemberCount() +
             room.currentState.getInvitedMemberCount();