- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Use 'manual page' instead of 'man page' for consistency.

Approved by: re (hrs)

mdoc(7) police: nits.

Fix up the wording thoughout, and document locking.

Update function definitions and required include files to reflect
the current state of the system.

Approved by: alfred

Add a few more manpages from Chad.
Fold major.9, minor.9, umajor.9, and uminor.9 into a single device_ids.9.