Contact
Email [email protected] and someone will read it.
Reporting a wrong page
Say which symbol and which WordPress release you were looking at. Both are on the page: the release is in the header, and the exact source file and line the page was generated from are in the “About this page” section at the bottom. With those, a fix applies to every release sharing that signature at once.
Something missing
The reference covers the releases listed in the footer. If a symbol you expect is absent it usually means it was added or removed in a release outside that window, which is worth telling us about.