Clarify context manager version availability

StevenMaude · StevenMaude · commit 414445562aca · 2015-08-17T23:52:18.000+01:00
It's only Python 2.5.X that needs the __future__ with. See https://www.python.org/dev/peps/pep-0343/ "In Python 2.5, the new syntax will only be recognized if a future statement is present: from __future__ import with_statement <snip> In Python 2.6, the new syntax will always be recognized; 'with' and 'as' are always keywords."
diff --git a/targeting_python_2_3.rst b/targeting_python_2_3.rst
@@ -19,7 +19,7 @@ The first and most important method is to use ``__future__`` imports. It
 allows you to import Python 3 functionality in Python 2. Here is an
 example:
 
--  Context manager were new in Python 3. For using them in Python 2.5+
+-  Context managers were new in Python 2.6+. For using them in Python 2.5+
    you can use:
 
 .. code:: python
