Changed (again) technique to get version IDs shown in docs from source code.

Hopefully it will fix the problem with the documentation building server
that caused a wrong Django version to be reported in the HTML zipball
docs edition.

Follow-up to commits 373df56d and 0b98ef63.

docs/conf.py

@@ -16,8 +16,8 @@ from __future__ import unicode_literals
 import sys
 from os.path import abspath, dirname, join
 
-# Make sure we use this copy of Django
-sys.path.insert(1, abspath(dirname(dirname(__file__))))
+# Make sure we iget the version of this copy of Django
+sys.path.insert(1, dirname(dirname(abspath(__file__))))
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the