Fix JSDoc for CSSStyleSheet#deleteRule

Author: NV

lib/CSSStyleSheet.js

@@ -54,9 +54,8 @@ CSSOM.CSSStyleSheet.prototype.insertRule = function(rule, index) {
  *   sheet.toString()
  *   -> "body{margin:0;}"
  *
- * @param {number} index
+ * @param {number} index within the style sheet's rule list of the rule to remove.
  * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSStyleSheet-deleteRule
- * @return {number} The index within the style sheet's rule list of the rule to remove.
  */
 CSSOM.CSSStyleSheet.prototype.deleteRule = function(index) {
 	if (index < 0 || index >= this.cssRules.length) {