Formatted docs/api_stability.txt in our ReST format, with titles

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3489 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/api_stability.txt

@@ -6,6 +6,9 @@ Although Django has not reached a 1.0 release, the bulk of Django's public APIs
 stable as of the 0.95 release. This document explains which APIs will and will not
 change before the 1.0 release.
 
+What "stable" means
+===================
+
 In this context, stable means:
 
    - All the public APIs -- everything documented in the linked documents, and
@@ -24,6 +27,9 @@ In this context, stable means:
    - We'll only break backwards compatibility of these APIs if a bug or
      security hole makes it completely unavoidable.
 
+Stable APIs
+===========
+
 These APIs are stable:
 
    - `Caching`_.
@@ -114,4 +120,4 @@ change:
 .. _url dispatch: http://www.djangoproject.com/documentation/url_dispatch/
 .. _forms and validation: http://www.djangoproject.com/documentation/forms/
 .. _serialization: http://www.djangoproject.com/documentation/serialization/
-.. _authentication: http://www.djangoproject.com/documentation/authentication/
\ No newline at end of file
+.. _authentication: http://www.djangoproject.com/documentation/authentication/