MFC r305857,r305858,r305859:

sbin/rcorder/rcorder.8: Amend HISTORY

rcorder appeared in FreeBSD 5.0.
Address issues raised by igor.

PR: 212547
Submitted by: Sevan Janiyan <venture37@geeklan.co.uk>

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r305858 | allanjude | 2016-09-16 04:11:04 +0000 (Fri, 16 Sep 2016) | 10 lines

sbin/reboot/reboot.8: Amend HISTORY

A standalone reboot utility showed up in 4.0BSD, in AT&T UNIX init has a
case for reboot and is present in the version shipped with V5

either way, current entry is incorrect.

PR: 212548
Submitted by: Sevan Janiyan <venture37@geeklan.co.uk>

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r305859 | allanjude | 2016-09-16 04:12:32 +0000 (Fri, 16 Sep 2016) | 8 lines

sbin/umount/umount.8: Amend HISTORY

umount first appeared in V1, confirmed using TUHS archive
http://minnie.tuhs.org/cgi-bin/utree.pl?file=V1/man/man1/umount.1

PR: 212554
Submitted by: Sevan Janiyan <venture37@geeklan.co.uk>