Update twistcli_gs.md

[jamcg]

Description

Remove old references to vulnerability and compliance threshold flags.

Motivation and Context

Remove old references to vulnerability and compliance threshold flags as they are no longer present in twistcli. 20.04.163 release notes "Existing CI policies defined with twistcli parameters, such as --vulnerability-threshold, --compliance-threshold, etc, have been deprecated. All those parameters are now centrally defined in Console in a new dedicated CI policy page. If you try to pass these parameters to twistcli version 20.04.163, twistcli will exit with an error: Incorrect Usage: flag provided but not defined. When upgrading to 20.04, you must fix how twistcli is called in your pipeline (remove deprecated policy params) and re-implement your policy in Console’s new CI policy engine."

How Has This Been Tested?

N/A

Screenshots (if appropriate)

N/A

Types of changes

Documentation update

Checklist

• [x ] I have updated the documentation accordingly.
• [x ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes if appropriate.
• [ ] All new and existing tests passed.

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