Fix typo in `/_matrix/client/v3/rooms/{roomId}/redact/{eventId}/{txnId}` (#2047)

Signed-off-by: Johannes Marbach <n0-0ne+github@mailbox.org>

changelogs/client_server/newsfragments/2047.clarification

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

data/api/client-server/redaction.yaml

@@ -27,8 +27,8 @@ paths:
 
         Any user with a power level greater than or equal to the `m.room.redaction`
         event power level may send redaction events in the room. If the user's power
-        level greater is also greater than or equal to the `redact` power level
+        level is also greater than or equal to the `redact` power level of the room,
-        of the room, the user may redact events sent by other users.
+        the user may redact events sent by other users.
 
         Server administrators may redact events sent by users on their server.
       operationId: redactEvent