Update spec_test_runner.ts

Author: schmidt-sebastian

packages/firestore/test/unit/specs/spec_test_runner.ts

@@ -716,7 +716,7 @@ abstract class TestRunner {
 
   private async doChangeUser(user: string | null): Promise<void> {
     this.user = new User(user);
-    // We don't block on `handleUserChange` as it may not get executed
+    // We don't block on `handleCredentialChange` as it may not get executed
     // during an IndexedDb failure. Non-recovery tests will pick up the user
     // change when the AsyncQueue is drained.
     this.queue.enqueueRetryable(() =>