[1.8.x] Fixed typo in docs/topics/auth/default.txt

Backport of 00d763a4 from master

docs/topics/auth/default.txt

@@ -849,8 +849,8 @@ implementation details see :ref:`using-the-views`.
 
         {% if next %}
             {% if user.is_authenticated %}
-            <p>You account doesn't have access to this page. To proceed, please
-            login with an account that has access.</p>
+            <p>Your account doesn't have access to this page. To proceed,
+            please login with an account that has access.</p>
             {% else %}
             <p>Please login to see this page.</p>
             {% endif %}