Update specification/client_server_api.rst

Co-Authored-By: Kitsune Ral <Kitsune-Ral@users.sf.net>

specification/client_server_api.rst

@@ -1535,7 +1535,7 @@ same way a server does.
 
     Redacted events can still affect the state of the room. When redacted,
     state events behave as though their properties were simply not specified
-    unless their properties are protected by the redaction algorithm. For example,
+    except those protected by the redaction algorithm. For example,
     a redacted ``join`` event will still result in the user being considered joined.
     Similarly, a redacted topic does not necessarily cause the topic to revert to
     what is was prior to the event - it causes the topic to be removed from the room.