fix help line for ecdsa.
fix help line for ecdsa.


threatstack/libldns,benlaurie/ldns,threatstack/libldns,benlaurie/ldns,benlaurie/ldns,threatstack/libldns,NLnetLabs/ldns,threatstack/libldns,gegenschall/ldns,NLnetLabs/ldns,threatstack/libldns,NLnetLabs/ldns,gegenschall/ldns,gegenschall/ldns,gegenschall/ldns,benlaurie/ldns,NLnetLabs/ldns