doc/xmlwf.sgml: Address GROFF issue
doc/xmlwf.sgml: Address GROFF issue

GROFF expects a macro name after a leading point. So remove
the linebreak and avoid the warning.

tiran/expat,libexpat/libexpat,libexpat/libexpat,libexpat/libexpat,tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat