rc_parallel has never been considered a stable feature of openrc. To
that end, I am removing the documentation for this feature from
rc.conf.
It is still available, but bugs against it are not considered stable
blockers, and it should only be used currently by developers and users
who are willing to test the feature.
X-Gentoo-Bug: 391945
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=391945
695f3886fb