Add periods to list items per Markdown style guide#50984

Evangelink merged 2 commits into

dev/amauryleve/mstest-apisdotnet/docs:dev/amauryleve/mstest-apisfrom

copilot/sub-pr-50979-one-more-timedotnet/docs:copilot/sub-pr-50979-one-more-timeCopy head branch name to clipboard