man: encode hyphens the way groff/man requires it

Edit a few spots where indeed a hyphens (U+2010) rather than U+002D is desired.
("set-name" is not something you input, it is a placeholder in the context of
documentation. "out-of-flow" is part of the regular flowed text, so should not
use anything but hyphens.)

Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Phil Sutter <phil@nwl.cc>

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