Original commit message from CVS:
* docs/manual/advanced-position.xml:
* docs/manual/basics-bins.xml:
* docs/manual/basics-bus.xml:
* docs/manual/basics-pads.xml:
* docs/manual/intro-gstreamer.xml:
* docs/manual/intro-preface.xml:
Some Application Development Manual fixes thanks to
Andrew Feren. Fixes #558459.