* Adds documentation for `wipe` and `commit`
This adds documentation to `wipe` and `commit` of `Externalities`.
Besides that it removes the default implementation that would just panic
and requires that all implementers of the trait implement the functions.
* Update primitives/externalities/src/lib.rs
Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>