[1.8.x] Refs #25886 -- Improved language in Python compatibility section of the release notes.

Backport of 26c26e83 from master

docs/releases/1.7.txt

@@ -23,8 +23,8 @@ Python compatibility
 Django 1.7 requires Python 2.7, 3.2, 3.3, or 3.4. We **highly recommend** and
 only officially support the latest release of each series.
 
-Since Django 1.6, support for Python 2.6 has been dropped and support for
-Python 3.4 has been added.
+The Django 1.6 series is the last to support Python 2.6. Django 1.7 is the
+first release to support Python 3.4.
 
 This change should affect only a small number of Django users, as most
 operating-system vendors today are shipping Python 2.7 or newer as their default

docs/releases/1.8.txt

@@ -28,6 +28,8 @@ Python compatibility
 Django 1.8 requires Python 2.7, 3.2, 3.3, 3.4, or 3.5. We **highly recommend**
 and only officially support the latest release of each series.
 
+Django 1.8 is the first release to support Python 3.5.
+
 Due to the end of upstream support for Python 3.2 in February 2016, we won't
 test Django 1.8.x on Python 3.2 after the end of 2016.