Remove recursive "see also" link from GetAppDocumentsDir() docs.

This was probably supposed to be "@see GetDocumentsDir()", but as this
function is already mentioned, and auto-linked by Doxygen, just above, another
link to it is unnecessary, so remove it.

Closes #16520.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77524 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/stdpaths.h

@@ -97,8 +97,6 @@ public:
         - Mac: @c ~/Documents/appinfo
 
         @since 2.9.0
-
-        @see GetAppDocumentsDir()
      */
     virtual wxString GetAppDocumentsDir() const;