New comment by jjsullivan5196 on void-packages repository

https://github.com/void-linux/void-packages/pull/24072#issuecomment-685260849

Comment:
I can't find any repos from pine64 that provide this rule, but the rule itself will work with any devices made from the current supply chain [(available until ~2024)](https://wiki.pine64.org/index.php?title=PinePhone) after then PINE64 will probably be shipping a different product.

I'd get it from upstream if it were available, but I think things like this are inconsequential to PINE64 themselves. I'm fine with adding some docs as a replacement if this isn't advisable.

tl;dr for including the rule: the 3 ports for the modem don't have stable names in `/dev/`, as they're just USB COM devices. The rule gives them reasonable identifiers (like `/dev/EG25.AT` for the AT command port) so scripts/programs don't have to dig up which USB device they need to talk to.