Remove a broken link and change another link in "How to review security advisory coverage application"s

Documentation location/URL

https://www.drupal.org/node/894256

Problem/Motivation

There are broken links:

(1) The link to best practices (https://www.drupal.org/node/287350) is broken.

Security and code quality (high priority) is very important to Drupal's reputation. So, ensuring that all projects are written to Drupal's coding standards and best practices is a critical role for reviewers. Writing high quality, secure code empowers all Drupal users and developers to be able to interact with it, both with understanding and developing, and helps streamlines collaboration.

(2) Both links have the same target:

Licensing (high priority) requirements for the code that is hosted on drupal.org is fairly strict. It is important to maintain this so that the community of users benefits from all the code, and drupal.org does not have any serious legal problems. 3rd party libraries on Drupal.org have specific requirements which extends to Why drupal.org doesn't host GPL-"compatible" code.

Proposed resolution

(1) Use link for "coding standards and best practices".

(2) Replace last sentence with: "See specific requirements for 3rd party libraries on Drupal.org." and link to https://www.drupal.org/node/422996

Remaining tasks