Document that wxStandardPaths::GetUserConfigDir() doesn't use app info.

Explicitly mention this instead of just relying on the examples to convey it.

Closes #11275.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70543 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/stdpaths.h

@@ -237,7 +237,8 @@ public:
         - Mac: @c ~/Library/Preferences
 
         Only use this method if you have a single configuration file to put in this
-        directory, otherwise GetUserDataDir() is more appropriate.
+        directory, otherwise GetUserDataDir() is more appropriate as the latter
+        adds @c appinfo to the path, unlike this function.
     */
     virtual wxString GetUserConfigDir() const;