r322410 | ken | 2017-08-11 12:43:52 -0600 (Fri, 11 Aug 2017) | 16 lines

Add historical notes on QIC tape drives and fix a couple of issues in mt(1).

 o Density code 0x5 is also known as QIC-11, and should have a footnote
   reference.
 o Add notes on QIC tape drives from the bug report.  These may help anyone
   trying to use a QIC drive.
 o Take out a "more more" instance found by igor.
 o Bump the man page date.

The PR is 14 years old, so it's past time to retire it.

PR:		doc/[[ https://bugs.freebsd.org/53596 | 53596 ]]
Submitted by:	tedm@toybox.placo.com
Reviewed by:	bcr
Sponsored by:	Spectra Logic

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