It says "If you want to use the udev-tweaks Gentoo added to make your life comfortable, then read no more." and I found this missleading because I began searching for a package called udev-tweaks and googled for it but didn't find anything. So I asked in #gentoo on freenode and found out, that it just means "default settings of udev merge which come with gentoo by default". So I think this should be maybe reformulated, maybe like "if you don't want to keep the default udev tweaks gentoo brings with the emerge..." Thanks. Reproducible: Always
Done thanks for reporting!