docs(ngMessages): missing quotation mark...

... let the example fail. It seem to be a copy paste fail.

Author: ElRaph

src/ngMessages/messages.js

@@ -275,7 +275,7 @@ angular.module('ngMessages', [])
     * </ANY>
     *
     * <!-- or by using element directives -->
-    * <ng-messages for="expression" role="alert>
+    * <ng-messages for="expression" role="alert">
     *   <ng-message when="stringValue">...</ng-message>
     *   <ng-message when="stringValue1, stringValue2, ...">...</ng-message>
     *   <ng-message when-exp="expressionValue">...</ng-message>
@@ -303,7 +303,7 @@ angular.module('ngMessages', [])
     *       </label>
     *       <pre>myForm.myName.$error = {{ myForm.myName.$error | json }}</pre>
     *
-    *       <div ng-messages="myForm.myName.$error" style="color:maroon" role="alert>
+    *       <div ng-messages="myForm.myName.$error" style="color:maroon" role="alert">
     *         <div ng-message="required">You did not enter a field</div>
     *         <div ng-message="minlength">Your field is too short</div>
     *         <div ng-message="maxlength">Your field is too long</div>
@@ -492,12 +492,12 @@ angular.module('ngMessages', [])
     * @usage
     * ```html
     * <!-- using attribute directives -->
-    * <ANY ng-messages="expression" role="alert>
+    * <ANY ng-messages="expression" role="alert">
     *   <ANY ng-messages-include="remoteTplString">...</ANY>
     * </ANY>
     *
     * <!-- or by using element directives -->
-    * <ng-messages for="expression" role="alert>
+    * <ng-messages for="expression" role="alert">
     *   <ng-messages-include src="expressionValue1">...</ng-messages-include>
     * </ng-messages>
     * ```
@@ -548,13 +548,13 @@ angular.module('ngMessages', [])
     * @usage
     * ```html
     * <!-- using attribute directives -->
-    * <ANY ng-messages="expression" role="alert>
+    * <ANY ng-messages="expression" role="alert">
     *   <ANY ng-message="stringValue">...</ANY>
     *   <ANY ng-message="stringValue1, stringValue2, ...">...</ANY>
     * </ANY>
     *
     * <!-- or by using element directives -->
-    * <ng-messages for="expression" role="alert>
+    * <ng-messages for="expression" role="alert">
     *   <ng-message when="stringValue">...</ng-message>
     *   <ng-message when="stringValue1, stringValue2, ...">...</ng-message>
     * </ng-messages>