test_runnner: fix grammar issue on test description

Author: JacopoPatroclo

test/parallel/test-runner-run-watch.mjs

@@ -257,7 +257,7 @@ describe('test runner watch mode', () => {
     assert.notDeepStrictEqual(durations[0][1], durations[1][1]);
   });
 
-  it('should emits test:watch:restarted when file is updated', async () => {
+  it('should emit test:watch:restarted when file is updated', async () => {
     let alreadyDrained = false;
     const events = [];
     const testWatchRestarted = common.mustCall(1);