fixing a function comment switching to the XML/XSLT doc generation closing

* xmlschemas.c doc/libxml2-api.xml: fixing a function comment
* doc/Makefile.am doc/apibuild.py doc/gnome-xml.sgml: switching
  to the XML/XSLT doc generation closing #111799
* doc/html/*: complete update of the HTML results
Daniel
48 files changed