test(router): fix typo in spec name

modules/angular2/test/router/integration/router_integration_spec.ts

@@ -42,7 +42,7 @@ export function main() {
 
     // do not refactor out the `bootstrap` functionality. We still want to
     // keep this test around so we can ensure that bootstrapping a router works
-    describe('boostrap functionality', () => {
+    describe('bootstrap functionality', () => {
       it('should bootstrap a simple app', inject([AsyncTestCompleter], (async) => {
            var fakeDoc = DOM.createHtmlDocument();
            var el = DOM.createElement('app-cmp', fakeDoc);