docs(ngList): fix typo

src/ng/directive/input.js

@@ -1159,7 +1159,7 @@ var requiredDirective = function() {
  * @name ng.directive:ngList
  *
  * @description
- * Text input that converts between comma-seperated string into an array of strings.
+ * Text input that converts between comma-separated string into an array of strings.
  *
  * @element input
  * @param {string=} ngList optional delimiter that should be used to split the value. If