Remove head lines and add versions of first Python 3 support

docs/python3.rst

@@ -7,32 +7,19 @@ Flask and all of its dependencies support Python 3 so you can in theory
 start working on it already.  There are however a few things you should be
 aware of before you start using Python 3 for your next project.
 
-Requirements
-------------
-
 If you want to use Flask with Python 3 you will need to use Python 3.3 or
 higher.  3.2 and older are *not* supported.
 
 In addition to that you need to use the latest and greatest versions of
-`itsdangerous`, `Jinja2` and `Werkzeug`.
-
-API Stability
--------------
+`itsdangerous`, `Jinja2` and `Werkzeug`. Flask 0.10 and Werkzeug 0.9 were
+the first versions to introduce Python 3 support.
 
 Some of the decisions made in regards to unicode and byte utilization on
 Python 3 make it hard to write low level code.  This mainly affects WSGI
 middlewares and interacting with the WSGI provided information.  Werkzeug
 wraps all that information in high-level helpers but some of those were
 specifically added for the Python 3 support and are quite new.
 
-A lot of the documentation out there on using WSGI leaves out those
-details as it was written before WSGI was updated to Python 3.  While the
-API for Werkzeug and Flask on Python 2.x should not change much we cannot
-guarantee that this won't happen on Python 3.
-
-Recommendations
----------------
-
 Unless you require absolute compatibility, you should be fine with Python 3
 nowadays. Most libraries and Flask extensions have been ported by now and
 using Flask with Python 3 is generally a smooth ride. However, keep in mind