gst/gstdebugutils.h: Mention GstDebugGraphDetails enum type in doc blurb so we get a link to it in the docs (since th...

Original commit message from CVS:
* gst/gstdebugutils.h: (GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS),
(GST_DEBUG_BIN_TO_DOT_FILE):
Mention GstDebugGraphDetails enum type in doc blurb so we get a link
to it in the docs (since these are macros the types of the arguments
won't be shown in the docs otherwise).