(modify-conf-info): Fixed typo: changed "text" to "conference".

doc/Protocol-A.texi

@@ -6971,9 +6971,9 @@ One of the items in @rarg{add} is illegal for some reason.
 
 
 This call deleted the aux-items listed in @rarg{delete} from the
-conference @rarg{conf} and then adds the ones listed in @rarg{add}
-to the text.  Either list may be empty, and the call is guaranteed to
-either completely fail or completely succeed.
+conference @rarg{conf} and then adds the ones listed in @rarg{add} to
+the conference.  Either list may be empty, and the call is guaranteed
+to either completely fail or completely succeed.
 
 @subheading Error codes