specs: remove nonsense pending with before examples.

A spec that contains before/after actions is not empty, so it
is non-sensical to expect that non-empty specification to be
pending by default, even though it has no non-reserved word
examples.
* specs/specl_spec.yaml (it is pending with a lone before)
(it is pending with a lone after, it is pending with before and)
(after): Remove.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
maint: update TODO.

* TODO.yaml (pending support): Remove.  Pending is fully
implemented now.
(report line numbers of pending and failed examples): New entry.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>