docs($resourceProvider): correct JS syntax error in code example

Closes #15360

Author: Harvinator

src/ngResource/resource.js

@@ -489,7 +489,7 @@ angular.module('ngResource', ['ng']).
      *     module('myApp').
      *     config(['$resourceProvider', function ($resourceProvider) {
      *       $resourceProvider.defaults.actions = {
-     *         create: {method: 'POST'}
+     *         create: {method: 'POST'},
      *         get:    {method: 'GET'},
      *         getAll: {method: 'GET', isArray:true},
      *         update: {method: 'PUT'},