add @deprecated comment for getCopyText

lib/ace/editor.js

@@ -754,6 +754,11 @@ var Editor = function(renderer, session) {
      * @param {String} text The copied text
      *
      **/
+    /**
+     * Returns the string of text currently highlighted.
+     * @returns {String}
+     * @deprecated Use getSelectedText instead.
+     **/
     this.getCopyText = function() {
         var text = this.getSelectedText();
         this._signal("copy", text);