Rather than direct users to look at $SPECDIR/spectemplate-*.spec for available templates, why don't we show them the available types?
I'm not certain that the second patch isn't more work than it's worth, but it should keep the output under 80 columns even if there are a few more templates added. Feel free to squash it on top of the first patch (assuming the first patch is acceptable, that is).
attachment 0001-Display-available-spec-template-types-in-rpmdev-news.patch
attachment 0002-Use-fmt-to-format-available-spec-template-types.patch
Both applied, along with a small followup change [199b549886ebf40c6ead0f2bec51cbc63c0908ba]. Thanks!