examples: add missing html label associations

closes #4884

Author: Hashen110

examples/auth/views/#.ejs

@@ -6,12 +6,12 @@
 Try accessing <a href="/restricted">/restricted</a>, then authenticate with "tj" and "foobar".
 <form method="post" action="/#">
   <p>
-    <label>Username:</label>
-    <input type="text" name="username">
+    <label for="username">Username:</label>
+    <input type="text" name="username" id="username">
   </p>
   <p>
-    <label>Password:</label>
-    <input type="text" name="password">
+    <label for="password">Password:</label>
+    <input type="text" name="password" id="password">
   </p>
   <p>
     <input type="submit" value="Login">