matrix: add links to https://github.com/matrix-org/matrix-spec/issues/neilalexander

pages/matrix.markdown

@@ -259,6 +259,8 @@ but regardless [still happens in all versions after that](https://github.com/mat
 
 You shouldn't just trust me or the variable on this site on what is the latest version, [consult the Spec](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions) and add [Version Checker](matrix:u/version:maunium.net) or [their sibling](https://github.com/maubot/rsvc) to your room and once they join, `!servers upgrade {{site.matrixLatestRoomVersion}}` replacing the {{site.matrixLatestRoomVersion}} with your target version.
 
+- See also [Matrix spec issues reported by Neil](https://github.com/matrix-org/matrix-spec/issues/neilalexander).
+
 #### How about DAG splits?
 
 DAG splits are a phenomenon somehow related to state resets above, but instead
@@ -274,6 +276,8 @@ People understanding state resolution (which by the way don't include me)
 disagree on the exact cause only agreeing that it's difficult to fix. From
 what is told to me, I understand it to be tracked [in the same Synapse issue #8629](https://github.com/matrix-org/synapse/issues/8629).
 
+- See also [Matrix spec issues reported by Neil](https://github.com/matrix-org/matrix-spec/issues/neilalexander).
+
 ### Can I have a non-federated room?
 
 Yes, there are two methods.