build: update SECURITY.md to match the content of angular/.github

Author: angular-robot[bot]

SECURITY.md

@@ -1,3 +1,3 @@
-Angular is part of Google [Open Source Software Vulnerability Reward Program](https://bughunters.google.com/about/rules/6521337925468160/google-open-source-software-vulnerability-reward-program-rules), for vulnerabilities in Angular please submit your report [here](https://bughunters.google.com/report).
+Angular is part of Google [Open Source Software Vulnerability Reward Program](https://bughunters.google.com/about/rules/6521337925468160/google-open-source-software-vulnerability-reward-program-rules). For vulnerabilities in Angular, please submit your report [here](https://bughunters.google.com/report).
 
-For more information on Angular's security policy visit: https://angular.io/guide/security
+For more information, check out [Angular's security policy](https://angular.io/guide/security).