Document wxFTP::TransferMode enum in the correct scope.

It's declared inside wxFTP class and not in global scope.

Closes #13976.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70590 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/protocol/ftp.h

@@ -6,16 +6,6 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-/**
-    Transfer modes used by wxFTP.
-*/
-enum TransferMode
-{
-    NONE,       //!< not set by user explicitly.
-    ASCII,
-    BINARY
-};
-
 /**
     @class wxFTP
 
@@ -100,6 +90,16 @@ enum TransferMode
 class wxFTP : public wxProtocol
 {
 public:
+    /**
+        Transfer modes used by wxFTP.
+    */
+    enum TransferMode
+    {
+        NONE,       //!< not set by user explicitly.
+        ASCII,
+        BINARY
+    };
+
     /**
         Default constructor.
     */