clarify comment

Author: lamafab

src/processor.rs

@@ -173,8 +173,8 @@ impl Actor for Processor {
                     actix::spawn(async move {
                         // Immediately exists if the lock cannot be acquired.
                         if let Ok(locked) = lock.try_lock() {
-                            // Lock acquired and will remain locked until the
-                            // handle goes out of scope.
+                            // Lock acquired and will remain locked until
+                            // `_l` goes out of scope.
                             let _l = locked;
 
                             match local(db, escalation_window).await {