Rust documentation is outdated

[mr-cal]

What needs to get done

The docs mention the rust-deps keyword which does not exist:

you can set rust-deps: ["rustc", "cargo"] and rust-channel: "none" in the part definition to override the default behaviour.

The docs should also be updated to reflect #903, which adds

Configures the following validation rules:
* 'rust-channel' is null or 'after: [rust-deps]': validate that cargo and rustc are installed
  and do not install rustup
* 'rust-channel' is defined: validate that rustup is installed
* 'rust-channel' and 'after: [rust-deps]' are defined: raise an error

Why it needs to get done

To have correct documentation

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3723.

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