Less confusing tagnames in comment

From #p5p:

16:00:01 < hobbs> avar: your rev names are weird and confused the hell out of me for a minute :)
16:04:46 <@avar> It's "git describe" output
16:05:58 < hobbs> yeah, it just sucks. Not sure why describe and name-rev both exist, but name-rev is at least less misleading here :)
16:06:28 < hobbs> perl-5.8.0-10189-ge1a479c falls between perl-5.9.4 and perl-5.9.5
16:12:00 <@avar> Ah, it's because git-describe only has annotated tags by default
16:13:32 < hobbs> I knew that mro didn't exist 10 years ago, thus the confusion
16:13:34 < haarg> name-rev == describe --contains