Document changes for static files handing

Fixes #605
Signed-off-by: Michal Čihař <michal@cihar.com>

docs/admin/upgrade.rst

@@ -257,6 +257,15 @@ have such, it is recommended to run:
 
     ./manage.py fixup_flags --all
 
+Upgrade from 2.3 to 2.4
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Handling of static content has been rewritten, please adjust configuration of
+your webserver accordingly. Most importantly:
+
+* ``/media/`` path is no longer used
+* ``/static/`` path now holds both admin and Weblate static files
+
 .. _django-17:
 
 Upgrading to Django 1.7

docs/changes.rst

@@ -29,6 +29,7 @@ Released on ? 2015.
 * Support for adding words to dictionary while translating.
 * Added support for filtering languages to be managed by Weblate.
 * Added support for translating and importing CSV files.
+* Rewritten handling of static files.
 
 weblate 2.3
 -----------