build fails on MacOS because "badly formatted"

[ludloff]

getting beyond bug #190 by removing -u for cp from doc/Makefile, this hits next:

perl -I../perllib -I. ./rdsrc.pl -I. -Mnasm00.html.dep -ohtml html nasmdoc.src
: reading ./nasmdoc.src...
: reading ./version.src...
: reading ./index.src...
: reading ./pptok.src...
: reading ./intro.src...
: reading ./running.src...
: reading ./lang.src...
: reading ./syntax.src...
: reading ./preproc.src...
: reading ./stdmac.src...
: reading ./macropkg.src...
: reading ./directiv.src...
: reading ./outfmt.src...
: reading ./16bit.src...
: reading ./32bit.src...
: reading ./mixsize.src...
: reading ./64bit.src...
: reading ./trouble.src...
: reading ./warn.src...
: reading ./warnings.src...
: reading ./ndisasm.src...
: reading ./changelog.src...
: reading ./changes.src...
: badly formatted \W: \W{https://bugs.nasm.us/} with details about the virtual environment, and we will figure out a suitable solution.
make[3]: *** [html/nasm00.html] Error 25
make[2]: *** [html] Error 2
make[1]: *** [doc] Error 2
make: *** [always_everything] Error 2