bug#53977: Improve markup in man pages

[Mario Blättermann]

Hello,

the SEE ALSO sections in the man pages contain links which will be
pulled in from *.x files by help2man. While help2man evaluates the
Groff markup from --help and --version output, it doesn't bother with
the markup in the *.x files. See the attached patch. The bold
formatting of the links is especially useful in HTML output (but also
in terminal output); the links become clickable and point to the
respective man page in online collections [1]. You can test the
behavior in the German version, where the links are already properly
formatted [2].

[1] https://man.archlinux.org/man/cat.1
[2] https://man.archlinux.org/man/cat.1.de

Best Regards,
Mario

seealso-markup.diff
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