Some few text fixes

Author: ricardopetrere

CCBoot.js

@@ -1064,7 +1064,7 @@ cc.loader = (function () {
                 loader = _register[type.toLowerCase()];
             }
             if (!loader) {
-                cc.error("loader for [" + type + "] not exists!");
+                cc.error("loader for [" + type + "] doesn't exist!");
                 return cb();
             }
             var realUrl = url;

cocos2d/actions/CCActionInterval.js

@@ -137,7 +137,7 @@ cc.ActionInterval = cc.FiniteTimeAction.extend(/** @lends cc.ActionInterval# */{
      *
      * @example
      * //example
-     * action.easeing(cc.easeIn(3.0));
+     * action.easing(cc.easeIn(3.0));
      * @param {Object} easeObj
      * @returns {cc.ActionInterval}
      */
@@ -997,7 +997,7 @@ cc.Spawn = cc.ActionInterval.extend(/** @lends cc.Spawn# */{
  * Create a spawn action which runs several actions in parallel.
  * @function
  * @param {Array|cc.FiniteTimeAction}tempArray
- * @return {cc.FiniteTimeAction}
+ * @return {cc.Spawn}
  * @example
  * // example
  * var action = cc.spawn(cc.jumpBy(2, cc.p(300, 0), 50, 4), cc.rotateBy(2, 720));
@@ -1022,7 +1022,7 @@ cc.spawn = function (/*Multiple Arguments*/tempArray) {
  * @static
  * @deprecated since v3.0 <br /> Please use cc.spawn instead.
  * @param {Array|cc.FiniteTimeAction}tempArray
- * @return {cc.FiniteTimeAction}
+ * @return {cc.Spawn}
  */
 cc.Spawn.create = cc.spawn;