Rewrite "archiv comment" text to match user documentation

https://github.com/codedthinking/bead/blob/b958eafbbee40c690fbb42985de09da7a6ac2ca8/bead/box.py#L74

This is a piece of documentation / marketing inside the code, treat it as such. Current version of docs (WIP): https://codedthinking.github.io/bead.zip/