fix: faulty action attr on fomr

Author: MaxLardenois

site/content/docs/0.3/forms/radio-button.md

@@ -272,7 +272,7 @@ Add the `disabled` attribute and the associated `<label>` are automatically styl
  You can display an invalid radio button by adding `.is-invalid` to a `.control-item-indicator`. Please take a look at our [Validation]({{< docsref "/forms/validation" >}}) page to know more about this.
 
 {{< example >}}
-<form action="" class="was-validated">
+<form class="was-validated">
   <div class="radio-button-item">
     <div class="control-item-assets-container">
       <input class="control-item-indicator" type="radio" value="" name="radioInvalid" id="radioInvalid" required>