doc/xmlwf.sgml: Fix typos
doc/xmlwf.sgml: Fix typos

This is backport of commit 4d84c6e89720523161031f3515adf35d1b07e156
from doc/xmlwf.1 to doc/xmwlf.sgml

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