[1.2.X] Fixed #14307 -- Added a new crossref target to model field re…

…ference docs and fixed broken relative link in form field reference docs. Thanks to adamv for the report.

Backport of [14234] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14235 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/forms/fields.txt

@@ -353,10 +353,8 @@ Takes one extra required argument:
 
     An iterable (e.g., a list or tuple) of 2-tuples to use as choices for this
     field. This argument accepts the same formats as the ``choices`` argument
-    to a model field. See the `model field reference documentation on choices`_
-    for more details.
-
-    .. _model field reference documentation on choices: ../models/fields#choices
+    to a model field. See the :ref:`model field reference documentation on
+    choices <field-choices>` for more details.
 
 ``TypedChoiceField``
 ~~~~~~~~~~~~~~~~~~~~

docs/ref/models/fields.txt

@@ -69,6 +69,8 @@ purely database-related, whereas :attr:`~Field.blank` is validation-related. If
 a field has ``blank=True``, validation on Django's admin site will allow entry
 of an empty value. If a field has ``blank=False``, the field will be required.
 
+.. _field-choices:
+
 ``choices``
 -----------