(minor): update mutexes example to use wg.Go instead of manual creation (#623)

* (minor): update mutexes example to use wg.Go instead of manual creation

* Create an output

Fixes #622

---------

Co-authored-by: Gala <dawo9889>

Author: Dawo9889

examples/mutexes/mutexes.go

@@ -45,16 +45,22 @@ func main() {
 		for range n {
 			c.inc(name)
 		}
-		wg.Done()
 	}
 
 	// Run several goroutines concurrently; note
 	// that they all access the same `Container`,
 	// and two of them access the same counter.
-	wg.Add(3)
-	go doIncrement("a", 10000)
-	go doIncrement("a", 10000)
-	go doIncrement("b", 10000)
+	wg.Go(func() {
+		doIncrement("a", 10000)
+	})
+
+	wg.Go(func() {
+		doIncrement("a", 10000)
+	})
+
+	wg.Go(func() {
+		doIncrement("b", 10000)
+	})
 
 	// Wait for the goroutines to finish
 	wg.Wait()

examples/mutexes/mutexes.hash

@@ -1,2 +1,2 @@
-1c56c75162419ced8437b7ebe53ee65e5479f645
-CawzyQnvH6W
+5271a346794ed097df21fb0f2b2d3d01c9bb361c
+u0VAVSWRlU0