Added jsdocs

Author: photonstorm

src/gameobjects/text/static/Text.js

@@ -1095,9 +1095,10 @@ var Text = new Class({
     },
 
     /**
-     * [description]
+     * Internal destroy handler, called as part of the destroy process.
      *
      * @method Phaser.GameObjects.Text#preDestroy
+     * @protected
      * @since 3.0.0
      */
     preDestroy: function ()