Added placeholder release notes for the 1.2.1 and 1.2.3 releases.

Both of these releases were to fix bugs in the previous release and, as
such contained nothing new of significance. However, to complete the set
of release note files in case anybody worries about the gaps, we now
have documents explaining precisely that.

Fixed #15330.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16695 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/releases/1.2.1.txt

+==========================
+Django 1.2.1 release notes
+==========================
+
+Django 1.2.1 was released almost immediately after 1.2.0 to correct two small
+bugs: one was in the documentation packaging script, the other was a bug_ that
+affected datetime form field widgets when localisation was enabled.
+
+.. _bug: https://code.djangoproject.com/ticket/13560
+

docs/releases/1.2.3.txt

+==========================
+Django 1.2.3 release notes
+==========================
+
+Django 1.2.3 fixed a couple of release problems in the 1.2.2 release and was
+released two days after 1.2.2.
+
+This release corrects the following problems:
+
+* The patch_ applied for the security issue covered in Django 1.2.2 caused
+  issues with non-ASCII responses using CSRF tokens.
+
+* The patch also caused issues with some forms, most notably the user-editing
+  forms in the Django administrative interface.
+
+* The packaging manifest did not contain the full list of required files.
+
+.. _patch: https://code.djangoproject.com/changeset/13699
+

docs/releases/index.txt

@@ -36,7 +36,9 @@ Final releases
 
    1.2.5
    1.2.4
+   1.2.3
    1.2.2
+   1.2.1
    1.2
 
 1.1 release