pub fn with_link(description: impl Into<String>, url: impl Into<String>) -> Self {
        Help {
            links: vec![HelpLink {
                description: description.into(),
                url: url.into(),
            }],
        }
    }
Creates a new [`Help`] struct with a single [`HelpLink`] in `links`.
tonic-types/src/richer_error/std_messages/help.rs