[sr #111102] ksh93 oddity w.r.t. ${1+"$@"} on AIX (for section "Portable Shell"?)

Follow-up Comment #3, sr #111102 (group autoconf):

Thanks, I fixed the doc typos you flagged. I didn't find more-general flaws,
though I was testing AIX 7.1 (also ksh93 Version M 93t+ 2009-05-01).


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