MFC 271048:
Always seek back to the beginning of a regular directory, even if the
previous seek location was 0.  Without this, readdir() would see
dd_loc of zero and call getdirentries() which would start reading
entries at the current seek location of the directory ignoring the
first batch of entries.  Also, rewinddir() should always seek so that
it reads the directory from the beginning to get updated entries.

PR:		192935
Approved by:	re (gjb)
Document r271095, vt(4) keymap support added to the syscons
rc(8) startup script.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271111, vt(4) enabled for PS3.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271116, ofwfb updated to work with
x11-servers/xorg-server.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271128, several performance enhancements to vt(4).

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271130, sys/boot/libstand moved to 32-bit specific
directory naming convention.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
- Refine entry for r271130 since a follow-up commit
  adds 64-bit libstand.

- Document r271135, initial UEFI boot support.

- Document r271136, boot1.efi, boot1.efifat, loader.efi
  installed to /boot.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271153, KSTACK_PAGES increased 4 -> 8 on powerpc64.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271205, powerpc ATI Radeon 9700 backlight fix.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271234, mrsas(4) enabled in GENERIC for amd64
and i386.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Document r271260, support for /etc/rc.d/<service>/
subdirectories.

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