chore: fix some typos in comments (#569)

Signed-off-by: youngwendy <clonefetch@outlook.com>

runner/engine.go

@@ -332,7 +332,7 @@ func (e *Engine) start() {
 				}
 			}
 
-			// cannot set buldDelay to 0, because when the write mutiple events received in short time
+			// cannot set buldDelay to 0, because when the write multiple events received in short time
 			// it will start Multiple buildRuns: https://github.com/cosmtrek/air/issues/473
 			time.Sleep(e.config.buildDelay())
 			e.flushEvents()
@@ -583,7 +583,7 @@ func (e *Engine) cleanup() {
 		close(e.binStopCh)
 		e.binStopCh = make(chan bool)
 	})
-	e.mainDebug("wating for	close watchers..")
+	e.mainDebug("waiting for	close watchers..")
 
 	e.withLock(func() {
 		for i := 0; i < int(e.watchers); i++ {

runner/engine_test.go

@@ -614,7 +614,7 @@ func TestRun(t *testing.T) {
 	engine.Stop()
 	time.Sleep(time.Second * 1)
 	assert.False(t, checkPortHaveBeenUsed(port))
-	t.Logf("stoped")
+	t.Logf("stopped")
 }
 
 func checkPortConnectionRefused(port int) bool {

runner/util_test.go

@@ -224,7 +224,7 @@ func Test_killCmd_SendInterrupt_false(t *testing.T) {
 	for _, line := range lines {
 		_, err := strconv.Atoi(line)
 		if err != nil {
-			t.Logf("failed to covert str to int %v", err)
+			t.Logf("failed to convert str to int %v", err)
 			continue
 		}
 		_, err = exec.Command("ps", "-p", line, "-o", "comm= ").Output()