* Clarify and expand docs.
* clarify that a pallet can verify an inherent without providing one.
* Clarify what calls `is_inherent_required`.
* caution and link to issue
* typo
* Apply suggestions from code review
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>