specl: remove underscore substitution in example descriptions.
specl: remove underscore substitution in example descriptions.

* lib/specl/runner.lua (run_examples): Remove underscore
substitutions, once and for all!

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

gvvaughan/specl