[Bug 268421] ATAN2(3) manpage contains UTF8 character codes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268421

--- Comment #3 from Yuri <yuri@aetern.org> ---
Those are mathematical characters documented in mandoc_char(7).  The one you
are talking about seems to be:

\(**             ∗           asterisk

As the page describes mathematical function, it seems to be acceptable?  There
are other non-standard characters used as well.  Other than getting fonts that
have the glyphs (I'm using e.g. iosevka, and everything looks fine), you can
force ASCII output by running it as `LC_ALL=C man atan2`; mandoc relies on
LC_CTYPE to decide if it should output UTF-8 or do the best-effort substitution
of those characters in ASCII output.

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