update(doc): fix typo and reword (#9898)

Author: LuxDie

src/components/chips/demoBasicUsage/index.html

@@ -13,7 +13,7 @@ <h2 class="md-title">Use a custom chip template.</h2>
       </md-chips>
 
       <div class="errors" ng-messages="fruitForm.fruitName.$error">
-        <div ng-message="md-max-chips">The maxmium of chips is reached.</div>
+        <div ng-message="md-max-chips">Maximum number of chips reached.</div>
       </div>
     </form>