parse-datetime.texi contains reference to date's --iso-8601 option

[J.T. Conklin]

While waiting for assignment paperwork, I'm looking into what changes
to the documentation and testsuite that will be needed to complete my
parse-datetime.y change.

In doc/parse-datetime.texi, I found a reference to the date command's
--iso-8601 option in the section that explains its output may not be
able to be parsed later.  The example uses "tr" to translate the 'T'
separator to a space, which will no longer be needed when my changes
to the parser can be committed.

However, date's --iso-8601 option has been deprecated since ~2005, 
and is no longer listed among the date options in the documentation.
The only instance in the coreutils docs is from the included parse-
datetime.texi.

So as I prepare my patch, should the parse-datetime.texi documentation
be changed to remove the "tr"; to remove the --iso-8601 example; or to
change it from --iso-8601 to --rfc-3339 (which also does not need the
"tr"); or would something else be more appropriate?

Thanks,

    --jtc

-- 
J.T. Conklin