I suggest there be an addendum created on this page (and others) indicating when a standard has changed -- links, for example. Doing so would allow users to find this page through a search engine when querying the older style links that are used in a plethora of non-updated examples. This would save others from the repeat of my unproductive experience:
I was following this page: https://stackoverflow.com/questions/49267591/how-to-best-add-extensions-when-using-official-docker-image-for-mediawiki in learning how to add some extensions but got tripped up on the old standard of linking to the code repository:
gerrit.wikimedia.org/r/p/mediawiki/extensions
whereas it is now:
gerrit.wikimedia.org/r/mediawiki/extensions
Most older examples accessing the repository incorporate the old standard link which no longer work and do not lead here.