Tiny comment fix.

src/proto/server/client.rs

@@ -86,7 +86,7 @@ impl Client {
   }
 
   // Performs the login exchange.
-  // Called this way because `public` is already taken.
+  // Called this way because `login` is already taken.
   async fn handshake(
     &mut self,
     options: &ClientOptions,