MFC: r264384, r264415

mdoc and language improvements.
MFC: r264386

Improve markup and remove contractions.
MFC: r264416

Add a missing comma between error message definitions.

CID:		1199266
Found with:	Coverity Prevent(tm)
MFC after:	1 week
MFC: r264418

Avoid double free in f_acl().

CID:		1018508
Found with:	Coverity Prevent(tm)