Add an example of using a registered permission to the docs here

[simonw]

https://docs.datasette.io/en/latest/plugin_hooks.html#register-permissions-datasette

This would benefit from an example of how to then check that registered permission.

[simonw]

https://docs.datasette.io/en/latest/internals.html#await-permission-allowed-actor-action-resource-none-default needs example code too:

And that should link to the register_permissions() docs and vice-versa.

[simonw]

I'd really like to fix that wart where resource= can be either a single string or a tuple of two strings though - that always catches me out.