Update index.md (#29447)

More informative description

guide/english/html/html-forms/index.md

@@ -40,6 +40,8 @@ Code example:
   <label for="password">Password:</label>
   <input type="password" name="password" id="password">
   <br>
+  <label for="age">Age:</label>
+  <input type="number" name="age" id="age">
   <input type="radio" name="gender" value="male">Male<br>
   <input type="radio" name="gender" value="female">Female<br>
   <input type="radio" name="gender" value="other">Other