specs: correct wording for no argument example.
specs: correct wording for no argument example.

* specs/specl_spec.yaml (specl): When called with no arguments,
specl now reads files from the specs subdirectory; reword
description to reflect that.

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

gvvaughan/specl