[1.2.X] Fixed #15055 -- added information about (and an example of) the csrf_token template tag to the forms documentation. Thanks to sneakyness for the report and bpeschier for the draft patch.

Backport of [15445] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15446 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/forms/index.txt

@@ -172,7 +172,7 @@ Forms are designed to work with the Django template language. In the above
 example, we passed our ``ContactForm`` instance to the template using the
 context variable ``form``. Here's a simple example template::
 
-    <form action="/contact/" method="post">
+    <form action="/contact/" method="post">{% csrf_token %}
     {{ form.as_p }}
     <input type="submit" value="Submit" />
     </form>
@@ -180,6 +180,15 @@ context variable ``form``. Here's a simple example template::
 The form only outputs its own fields; it is up to you to provide the surrounding
 ``<form>`` tags and the submit button.
 
+.. admonition:: Forms and Cross Site Request Forgery protection
+
+   Django ships with an easy-to-use :doc:`protection against Cross Site Request
+   Forgeries </ref/contrib/csrf>`. When submitting a form via POST with
+   CSRF protection enabled you must use the :ttag:`csrf_token` template tag
+   as in the preceding example. However, since CSRF protection is not
+   directly tied to forms in templates, this tag is omitted from the
+   following examples in this document.
+
 ``form.as_p`` will output the form with each form field and accompanying label
 wrapped in a paragraph. Here's the output for our example template::