MacPorts guide makes no mention of livecheck built-in functionality for github

[emcrisostomo (Enrico Maria Crisostomo)]

While updating the sysutils/fswatch port, I decided to add the livecheck configuration. I searched the guide (section 5.8) to see whether there was some builtin functionality for github but the only mentions I found are referring to mirror sites (freecode.com, sourceforge.net, /code.google.com). A search came up with the following MacPorts ticket:

​https://trac.macports.org/ticket/53940

As suggested in this ticket, I tried to simply add the following line to the Portfile and it appears to be working fine:

livecheck.url ${github.homepage}/releases/latest

Shouldn't the guide be updated in order to reflect this feature? I believe this is an important feature, given the relevance of Github nowadays.