Used to indicate that the article is partially or wholly copied from another distro's documentation.
This is useful as a lot of times, most or all of the information for another distro is true for void. For example, the ArchWiki can be as a source, and thinks like packaging stuff, systemd and others need to be changed. Using other wikis work saves a lot of time while providing quality documentation. This is not plagurism, we're not sending the wiki to a literature contest. Just as long as we properly acredit the original wiki