style: fix typos boostrap to bootstrap (#21917)

PR Close #21917

packages/platform-server/integrationtest/e2e/helloworld-spec.ts

@@ -12,7 +12,7 @@ import {verifyNoBrowserErrors} from './util';
 
 describe('Hello world E2E Tests', function() {
   it('should display: Hello world!', function() {
-    // Load the page without waiting for Angular since it is not boostrapped automatically.
+    // Load the page without waiting for Angular since it is not bootstrapped automatically.
     browser.driver.get(browser.baseUrl + 'helloworld');
 
     const style = browser.driver.findElement(by.css('style[ng-transition="hlw"]'));