Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Remove trailing whitespace per mdoc lint warningDisussed with: gavinNo objection from: docApproved by: joelMFC after: 3 days
Add sdhci driver man page. Link it up to mmc subsystem.
Remove stale BUGS.
Add man pages for mmc (the mmc bus) and mmcsd (the memory cardimplementation).