Reflect file-name rename in manual

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>
Rename the project to „amded”

...which is short for: Audio Meta-Data EDitor

There's another taggit, from 2006.

Also, every other reasonable project name is taken, aparently, by
projects with just a project page and no code at all... fuuu.

Signed-off-by: Frank Terbeck <ft@bewatermyfriend.org>