IT:AD:GitHub:HowTo:Change Issue State With Commit Commands
Summary
At this point in time (Q1/2019) GitHub's offering is not as rich as Bitbucket's offering. Bitbucket recognizes words in commit messages to close/put on hold/reopen/link any Bitbucket issue (see http://skysigal.com/it/ad/bitbucket/howto/close_issues_with_checkins).
If you are using Jira, one can also control Jira Tickets using Smart Commit messages.
Whereas GitHub seems to only offer words to close issues.
One can
* link to Azure WorkItems using the AB#123 (AB is for Azure Boards as opposed to GitHub items) format.
* close Azure WorkItems using Fixes AB#123 (but it doesn't recognize any other words).