Paul Eggert 920daa57a4 doc: update man for groff 1.23.0 and apostrophes
* doc/grep.in.1: Merge from groff 1.23.0 tmac/an-ext.tmac.
On Groff, fix usage neutral apostrophes;
they cannot be reliably fixed in traditional troff.
2025-03-21 13:17:03 -07:00
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