[1.8.x] Changed `action="."` to `action=""` in tests and docs.

`action="."` strips query parameters from the URL which is not usually what
you want. Copy-paste coding of these examples could lead to difficult to
track down bugs or even data loss if the query parameter was meant to alter
the scope of a form's POST request.

Backport of 77974a684a2e874bccd8bd9e0939ddcb367a8ed2 from master

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/ref/csrf.txt b/docs/ref/csrf.txt
index 85810b9d8b..dbc05b6e50 100644
--- a/docs/ref/csrf.txt
+++ b/docs/ref/csrf.txt
@@ -40,7 +40,7 @@ To take advantage of CSRF protection in your views, follow these steps:
 2. In any template that uses a POST form, use the :ttag:`csrf_token` tag inside
    the ``<form>`` element if the form is for an internal URL, e.g.::
 
-       <form action="." method="post">{% csrf_token %}
+       <form action="" method="post">{% csrf_token %}
 
    This should not be done for POST forms that target external URLs, since
    that would cause the CSRF token to be leaked, leading to a vulnerability.