I can't find that in postgres docs, so it looks like you copied that from docs of an old version (version 9.4 is not even supported anymore) (this particular content is still true, though). Annoyingly, google often serves up old pages before more up-to-date ones.
(There is a 'current' link on top of every postgres doc page, and a link for all supported versions, as well as a link into the docs of the development branch, at the moment 14devel -- and btw: 14beta is expected in a few weeks)
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