docs: Unbreak README Formatting (#18043)

- Makes headers consistent
 - Removes extra `)`
 - Makes browserstack line on a separate line

README.md

@@ -4,22 +4,20 @@
 [![Issue Stats](http://issuestats.com/github/angular/angular/badge/pr?style=flat)](http://issuestats.com/github/angular/angular)
 [![Issue Stats](http://issuestats.com/github/angular/angular/badge/issue?style=flat)](http://issuestats.com/github/angular/angular)
 [![npm version](https://badge.fury.io/js/%40angular%2Fcore.svg)](https://www.npmjs.com/@angular/core)
-)
+
 
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/angular2-ci.svg)](https://saucelabs.com/u/angular2-ci)
+
 *Safari (7+), iOS (7+), Edge (14) and IE mobile (11) are tested on [BrowserStack][browserstack].*
 
-Angular
-=========
-
-Angular is a development platform for building mobile and desktop web applications using Typescript/JavaScript (JS) and other languages.
+# Angular
 
+Angular is a development platform for building mobile and desktop web applications using Typescript/JavaScript and other languages.
 
 ## Quickstart
 
 [Get started in 5 minutes][quickstart].
 
-
 ## Want to help?
 
 Want to file a bug, contribute some code, or improve documentation? Excellent! Read up on our