Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Fix markup nits.
Tell the bitter truth that WITHOUT_GNU and WITHOUT_PAMdon't have any effect now.
Document some more src.conf(5) options:WITHOUT_GNU, WITHOUT_NS_CACHING, WITHOUT_PAM.Noticed by: src/tools/build/options/makeman