- mark all code blocks with ```
- unify empty lines between sections
- adjust list syntax (no space before dash)
- adjust headers to use Atx-style syntax
- remove trailing spaces
This was never enforced (and the way it's written is not enforceable).
So, lets remove dead text.
If we'd like to enforce something like this in the future, we'd need to
require contributors signing CLA. But it wouldn't apply to past
contributions anyway.
