documenting PortGroups?

[Peter Danecek]

Hi developers,

I realise, that there are may PortGroups available (which probably do a lot of useful stuff) but are currently not documented. Sure, there are the source codes e it may be my poor knowledge of TCL, but I fail to understand it in detail and only from the source one might miss the intended use.

So what about documenting them? If it's not documented, it does not exists, right?
In particular, I would be interested in PortGroup github.

~petr

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