[1.2.X] Fixed a crossref formatting problem in the signals reference docs.

Backport of [15092] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15093 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/signals.txt

@@ -31,9 +31,9 @@ module system.
     If you override these methods on your model, you must call the parent class'
     methods for this signals to be sent.
 
-	Note also that Django stores signal handlers as weak references by default,
-	so if your handler is a local function, it may be garbage collected.  To
-	prevent this, pass ``weak=False`` when you call the signal's :meth:`~django.dispatch.Signal.connect`.
+    Note also that Django stores signal handlers as weak references by default,
+    so if your handler is a local function, it may be garbage collected.  To
+    prevent this, pass ``weak=False`` when you call the signal's :meth:`~django.dispatch.Signal.connect`.
 
 pre_init
 --------
@@ -466,8 +466,8 @@ Arguments sent with this signal:
 
     sender
         The database wrapper class -- i.e.
-        :class: `django.db.backends.postgresql_psycopg2.DatabaseWrapper` or
-        :class: `django.db.backends.mysql.DatabaseWrapper`, etc.
+        :class:`django.db.backends.postgresql_psycopg2.DatabaseWrapper` or
+        :class:`django.db.backends.mysql.DatabaseWrapper`, etc.
 
     connection
         The database connection that was opened. This can be used in a