deny -> prevent

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

data/api/client-server/report_content.yaml

@@ -63,7 +63,7 @@ paths:
         - accessTokenBearer: []
       x-changedInMatrixVersion:
         1.18: |
-          Servers MAY deny room ID enumeration by using the 200 response
+          Servers MAY prevent room ID enumeration by using the 200 response
           regardless of the existence of the reported room and/or by adding
           a random delay when generating responses.
       responses:
@@ -150,7 +150,7 @@ paths:
           This endpoint now requires the user to be joined to the room.
         1.18: |
           The `score` request parameter was removed. Additionally, servers
-          may deny event ID enumeration by using the 200 response
+          may prevent event ID enumeration by using the 200 response
           regardless of the existence of the reported event.
       responses:
         "200":