Remove documentation of non-existent wxFontMapper::SetConfig().

Closes #13974.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70588 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/fontmap.h

@@ -179,14 +179,6 @@ public:
     */
     static wxFontMapper* Set(wxFontMapper* mapper);
 
-    /**
-        Set the config object to use (may be @NULL to use default).
-        By default, the global one (from wxConfigBase::Get() will be used)
-        and the default root path for the config settings is the string returned
-        by GetDefaultConfigPath().
-    */
-    void SetConfig(wxConfigBase* config);
-
     /**
         Set the root config path to use (should be an absolute path).
     */