Update documentation for License-Check rule

Merged mo khan requested to merge 13067-update-documentation into master

What does this MR do?

This MR adds documentation to describe how to enable the License-Check software license compliance rule. I chose to piggyback on the text that was written for the Vulnerability-Check rule.

A changelog entry was added here: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/15196. So I chose to omit one from this MR.

Related issues

#13067 (closed)

Author's checklist

Review checklist

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  2. Ensure a release milestone is set and that you merge the equivalent EE MR before the CE MR if both exist.
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Edited by mo khan