Updating required md files

[Leah-Xia-Microsoft]

Purpose

• Updating required md files according to the legal requirements https://docs.opensource.microsoft.com/releasing/#release-checklist

Pull Request Type

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:

Upstream sample reference

Links to PR(s) that made the original change in the upstream sample:

Other Information