More docs coverage and some ChangeLog surgery (add missing names)

Original commit message from CVS:
* gst/gstchildproxy.h:
* libs/gst/base/gstbasesink.h:
* libs/gst/base/gstbasesrc.h:
* libs/gst/base/gstbasetransform.h:
More docs coverage and some ChangeLog surgery (add missing names)
5 files changed