Fix link to QA docs page in QA Readme
What does this MR do and why?
Fixes a broken link to an anchor
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
N/A
How to set up and validate locally
- Check out this branch`
- In VSCode, open
qa/README.md
and command-click on the link to[list of supported environment variables](https://gitlab.com/gitlab-org/gitlab-qa/blob/master/docs/what_tests_can_be_run.md#supported-gitlab-environment-variables)
- The link will open in the browser and scroll to the correct anchor