Document wxFFile::GetName().

Somehow this method was not documented.

See #13903.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70491 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/ffile.h

@@ -146,6 +146,15 @@ public:
     */
     wxFileKind GetKind() const;
 
+    /**
+        Returns the file name.
+
+        This is the name that was specified when the object was constructed or
+        to the last call to Open(). Notice that it may be empty if Attach() was
+        called without specifying the name.
+     */
+    const wxString& GetName() const;
+
     /**
         Returns @true if the file is opened.