docs: remove typo (#454)

* docs: remove typo

* Update mutexes.go

* feat: add changes

Co-authored-by: Javier Pacareu <jpacareu.meli@gmail.com>

examples/mutexes/mutexes.go

@@ -56,7 +56,7 @@ func main() {
 	go doIncrement("a", 10000)
 	go doIncrement("b", 10000)
 
-	// Wait a for the goroutines to finish
+	// Wait for the goroutines to finish
 	wg.Wait()
 	fmt.Println(c.counters)
 }

examples/mutexes/mutexes.hash

@@ -1,2 +1,2 @@
-a437476f37f1f797e1bab491b3f2ac9b386f6700
-Kr_cdza5vyz
+d858d466e806a9dcb5992c8c2a3c6dc377a7a904
+JU735qy2UmB

public/mutexes

@@ -44,7 +44,7 @@ to safely access data across multiple goroutines.</p>
             
           </td>
           <td class="code leading">
-            <a href="https://go.dev/play/p/Kr_cdza5vyz"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
+            <a href="https://go.dev/play/p/JU735qy2UmB"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
           <pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
 </pre>
           </td>
@@ -189,7 +189,7 @@ and two of them access the same counter.</p>
         
         <tr>
           <td class="docs">
-            <p>Wait a for the goroutines to finish</p>
+            <p>Wait for the goroutines to finish</p>
 
           </td>
           <td class="code">