name the mint, not the publisher, as the writer of the client secrets

Finishes the sweep of prose that said the publisher unit writes or carries the OIDC client secrets: rust docs, nix comments and option descriptions, test names and docs.

swarm-secret-client/src/review_classifier.rs

@@ -74,7 +74,7 @@ pub fn client_secret_path(client_id: &str) -> Result<String, Error> {
 /// No `Debug`: `value` authenticates the classifier at the queue.
 #[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ClientSecret {
-    /// The secret, under the field name the publisher writes.
+    /// The secret, under the field name authelia's mint writes.
     pub value: String,
 }