Reword NameFormat message for hyphenated_lowercase

It was suggested that this message could be clearer.

Change-Id: I32020f69487c6b9d425ad7150a0ae714ff652752
Reviewed-on: http://gerrit.causes.com/44295
Tested-by: jenkins <jenkins@brigade.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>