Remove references to the timing bit. (#831)

* Remove references to the timing bit.
Fixes #827.  Also changed trigger examples to fix some bugs, add
the type field, add vs/vu in some examples, enhance one example
to include textra, etc.

* Review feedback

Co-authored-by: Tim Newsome <tim@sifive.com>
Signed-off-by: Paul Donahue <48959409+pdonahue-ventana@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Tim Newsome <tim@sifive.com>
Signed-off-by: Paul Donahue <48959409+pdonahue-ventana@users.noreply.github.com>

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Signed-off-by: Paul Donahue <48959409+pdonahue-ventana@users.noreply.github.com>
Co-authored-by: Tim Newsome <tim@sifive.com>