Update v1.2 changelog with missed PR (#3705)

changelogs/server_server/3528.clarification

@@ -1 +0,0 @@
-Fix various typos throughout the specification.

layouts/partials/changelogs/v1.2.md

@@ -80,7 +80,7 @@ Variables:
 <strong>Spec Clarifications</strong>
 
 
-- Fix various typos throughout the specification. ([#3527](https://github.com/matrix-org/matrix-doc/issues/3527))
+- Fix various typos throughout the specification. ([#3527](https://github.com/matrix-org/matrix-doc/issues/3527), [#3528](https://github.com/matrix-org/matrix-doc/issues/3528))
 - Clarify that `GET /_matrix/federation/v1/event_auth/{roomId}/{eventId}` does *not* return the auth chain for the full state of the room. ([#3583](https://github.com/matrix-org/matrix-doc/issues/3583))
 - Fix the rendering of the responses for various API endpoints. ([#3674](https://github.com/matrix-org/matrix-doc/issues/3674))