I found a "bug" of sorts in the documentation -- on pages 6 and 7, the document refers to using "wikicode" without first introducing the term. Actually, this should properly be "wiki markup" since "wikicode" is not the term the community uses. If you do a Google search on the term "wikicode" get the mw:Help:Formatting page that doesn't include the term "wikicode" and also the proper m:WikiCode project, which is not wiki markup. This should likely be changed so that both mentions of "wikicode" are "wiki markup".
https://en.wikipedia.org/wiki/File:Illustrating_Wikipedia_brochure.pdf