docs/gst/Makefile.am: Disable a bunch of headers from being scanned

docs/gst/Makefile.am: Disable a bunch of headers from being scanned

Original commit message from CVS:
* docs/gst/Makefile.am:  Disable a bunch of headers from being scanned
* docs/gst/gstreamer-docs.sgml:  More hacking
* docs/gst/gstreamer-sections.txt:
* docs/gst/tmpl/cothreads_compat.sgml:
* docs/gst/tmpl/gstcaps.sgml:
* docs/gst/tmpl/gstclock.sgml:
* docs/gst/tmpl/gstelement.sgml:
* docs/gst/tmpl/gstevent.sgml:
* docs/gst/tmpl/gstpad.sgml:
* docs/gst/tmpl/gstutils.sgml:
* docs/gst/tmpl/gstxml.sgml:
* docs/gst/tmpl/gthread-cothreads.sgml:
* docs/random/ds/0.9-suggested-changes:
* gst/elements/gstfakesink.h: doc fixes
* gst/elements/gstfakesrc.h: doc fixes
* gst/gstcaps.c: doc fixes
* gst/gstcaps.h: doc fixes
* gst/gstelement.c: doc fixes
* gst/gstelement.h: doc fixes
* gst/gstindex.c: doc fixes
* gst/gstinfo.c: doc fixes
* gst/gstpad.c: doc fixes
* gst/gstpad.h: doc fixes
* gst/gstplugin.c: doc fixes
* gst/gsttypefind.h: doc fixes
* gst/gsturi.c: doc fixes
* gst/gstvalue.c: doc fixes