Undeprecate /rooms/:roomid:/initialSync as there is no replacement yet

Signed-off-by: morguldir <morguldir@protonmail.com>

data/api/client-server/room_initial_sync.yaml

@@ -7,10 +7,13 @@ paths:
     get:
       summary: Snapshot the current state of a room and its most recent messages.
       description: |-
+        {{% boxes/note %}}
+        This api should now exclusively be used for "peeking" into publicly viewable rooms you're not a member of ([Room Previews](/client-server-api/#room-previews))
+        {{% /boxes/note %}}
         Get a copy of the current state and the most recent messages in a room.
 
-        This endpoint was deprecated in r0 of this specification. There is no
-        direct replacement; the relevant information is returned by the
+        Using this endpoint for something other than peeking was deprecated in r0 of this specification. \
+        The relevant information for syncing is now returned by the
         [`/sync`](/client-server-api/#get_matrixclientv3sync) API. See the
         [migration guide](https://matrix.org/docs/guides/migrating-from-client-server-api-v-1#deprecated-endpoints).
       operationId: roomInitialSync
@@ -161,7 +164,7 @@ paths:
             You aren't a member of the room and weren't previously a member of the room.
       tags:
         - Room participation
-      deprecated: true
+      deprecated: false
 servers:
   - url: "{protocol}://{hostname}{basePath}"
     variables: