Replaced @returns with @return for more standard command use and compatibility.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/dialup.h

@@ -101,7 +101,7 @@ public:
         by the system and so we don't do any polling and this parameter is
         ignored.
 
-        @returns @false if couldn't set up automatic check for online status.
+        @return @false if couldn't set up automatic check for online status.
     */
     bool EnableAutoCheckOnlineStatus(size_t nSeconds = 60);