Document defaults, e.g. `[advisories]`

[dvdplm]

A deny.toml without an [advisories] section will still check the RustSec when running cargo deny check advisories. This is great and the correct behaviour imo, but it would be good to document the default value for all configuration option and afaict it is not.

Thanks! :)

[Jake-Shadle]

All the configuration defaults are documented in https://embarkstudios.github.io/cargo-deny/checks/advisories/cfg.html, but yes, it might not be clear that not having the advisories section entirely will use the defaults when you do the check.

[dvdplm]

Ah I missed that page, my bad. Thanks.