Add some additional clarification and fix a few gammer nits.

Reviewed by: kib
MFC after:   3 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275846 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Bump Dd for r275846

MFC after:	3 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275847 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f