removed incorrect doc. [skip ci]

docs/guide/form.md

@@ -98,20 +98,7 @@ To customize the output, you can chain additional methods to this call:
 ```
 
 This will create all the `<label>`, `<input>` and other tags according to the template defined by the form field.
-To add these tags yourself you can use the `Html` helper class. The following is equivalent to the code above:
-
-```php
-<?= Html::activeLabel($model, 'password') ?>
-<?= Html::activePasswordInput($model, 'password') ?>
-<?= Html::error($model, 'password') ?>
-
-or
-
-<?= Html::activeLabel($model, 'username', ['label' => 'name']) ?>
-<?= Html::activeTextInput($model, 'username') ?>
-<div class="hint-block">Please enter your name</div>
-<?= Html::error($model, 'username') ?>
-```
+To add these tags yourself you can use the `Html` helper class.
 
 If you want to use one of HTML5 fields you may specify input type directly like the following: