s/should/must for redaction algorithm
This feels like it was a mistake some time ago considering the redaction algorithm is used in very strict algorithms like event signing.
@@ -31,7 +31,7 @@ implementation.
Redactions
~~~~~~~~~~
-Upon receipt of a redaction event, the server should strip off any keys not in
+Upon receipt of a redaction event, the server must strip off any keys not in
the following list:
- ``event_id``
@@ -54,7 +54,7 @@ the following list:
Some of the keys, such as ``hashes``, will appear on the federation-formatted
event and therefore the client may not be aware of them.
-The content object should also be stripped of all keys, unless it is one of
+The content object must also be stripped of all keys, unless it is one of
one of the following event types:
- ``m.room.member`` allows key ``membership``.
