MFC 253433:

    In this GRN, Marcel Moolenaar overhauled the logic for mounting
    the root file system on bootup:

       |------------------------------------------------------------------------
       |r214006 | marcel | 2010-10-17 22:01:53 -0700 (Sun, 17 Oct 2010) | 20 lines
       |
       | Re-implement the root mount logic using a recursive approach, whereby each
       |root file system (starting with devfs and a synthesized configuration) can
       |contain directives for mounting another file system as root.
       |------------------------------------------------------------------------

    This commit adds a mount.conf(8) man page which documents
    the root mount logic.  mount.conf(8) also provides some examples
    for the /.mount.conf file, which can be used to change the root mount behavior.

    Reviewed by: marcel bjk

MFC: 253445:

    Minor mdoc fixes

Approved by: re (gjb)