Fixed #13351: Added documentation about the cx_Oracle 'threaded' option to the oracle backend notes.

Thanks to Skaffen for the suggestion.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14630 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/databases.txt

@@ -572,6 +572,19 @@ recognizes the SID ("xe" in this example), then fill in both
 You should supply both ``HOST`` and ``PORT``, or leave both
 as empty strings.
 
+Threaded option
+----------------
+
+If you plan to run Django in a multithreaded environment (e.g. Apache in Windows
+using the default MPM module), then you **must** set the ``threaded`` option of
+your Oracle database configuration to True::
+
+            'OPTIONS': {
+                'threaded': True,
+            },
+
+Failure to do this may result in crashes and other odd behavior.
+
 Tablespace options
 ------------------