Update v6 room proposal for modern activity

proposals/2240-rooms-v6.md

@@ -1,21 +1,14 @@
 # MSC2240: Room Version 6
 
-A new room version, `6`, is proposed using [room version 5](https://matrix.org/docs/spec/rooms/v5.html)
-as a starting point and incorporating the following MSCs:
+A new room version, `6`, is proposed using [room version 5](https://matrix.org/docs/spec/rooms/v5.html) as a base
+and incorporating the following MSCs:
 
-* [MSC2174](https://github.com/matrix-org/matrix-doc/pull/2174) - Moving the `redacts` key.
-* [MSC2175](https://github.com/matrix-org/matrix-doc/pull/2175) - Removing the `creator` from create events.
-* [MSC2176](https://github.com/matrix-org/matrix-doc/pull/2176) - Modern redaction rules.
 * [MSC2209](https://github.com/matrix-org/matrix-doc/pull/2209) - Including notifications in power level auth rules.
-* [MSC2212](https://github.com/matrix-org/matrix-doc/pull/2212) - Third party user power levels.
-* [MSC2213](https://github.com/matrix-org/matrix-doc/pull/2213) - Rejoinability of invite-only rooms.
-* [MSC1849](https://github.com/matrix-org/matrix-doc/pull/1849) - Event aggregations/relationships.
+* [MSC2212](https://github.com/matrix-org/matrix-doc/pull/2432) - Alias event authorisation and redaction.
+* PLACEHOLDER - Something to do with integers.
 
-MSCs which require a new room version and are excluded from v6 are:
-* [MSC2214](https://github.com/matrix-org/matrix-doc/pull/2214) - Joining upgraded private rooms.
-  This MSC is excluded due to the solution not being fully worked out. As this v6 proposal progresses,
-  it is possible for it to be included in the future.
+Though other MSCs are capable of being included in this version, they do not have sufficient implementation to be
+considered stable enough for v6 rooms. A future room version may still include them.
 
-
-Room version 6 upon being added to the specification shall be considered stable. No other room versions
-are affected by this MSC.
+Room version 6 upon being added to the specification shall be considered stable. No other room versions are affected
+by this MSC.