doc: avoid duplicate entries in manpage

Commit v1.4.9-35-gd4105ad changed from [A-Z] and [a-z] to use
[[:alnum:]], which unfortunately drew matches into the target section,
and targets into the match section. [[:upper:]] and [[:lower:]] should
have been used instead, of course.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
1 file changed