fixup! docs: Add docs for the KeyId

src/types/mod.rs

@@ -84,7 +84,10 @@ pub enum KeyError {
     ///
     /// For more details on contributory behavior please refer to the
     /// [`x25519_dalek::SharedSecret::was_contributory()`] method.
-    #[error("At least one of the keys did not have contributory behaviour")]
+    #[error(
+        "One or more keys lacked contributory behavior in the Diffie-Hellman operation, \
+         resulting in an insecure shared secret"
+    )]
     NonContributoryKey,
 }