Remove the documentation string from facts?

Is the documentation string needed? there is always the `testing` from `clojure.test` than can be used for that. There would be less syntax to learn & simpler code.

What do you think?

Review the proposal to remove documentation strings from facts and rely on `testing` from `clojure.test`. Before starting, determine whether this design change is wanted; done would mean an agreed approach with updated behavior and tests, but the issue names no files or tests.

Written by the indexing model from the issue text.