Your link is for an old version of Postgres (8.3). Current version is 10. You can find the link for the relaive page easily, it's on the top of the page, if you use a different version that 10 (I hope you are not still at 8.3 !)
My pg_hba.conf file gives 'cert' as an authentication method. this is not mentioned on this page.
I think a basic pg_hba.conf to allow remote access require ssl, and to prevent access to the postgres table would be a useful addition. The more I see about this powerful environment the more nervous I get about exploits based on aspects of it's multitude of features of which I am completely unaware - what about PUBLIC for example ? ? A basic security guide to disable dangerous defaults would be very welcome