Merge typo fix in docstring from milki.

dulwich/tests/test_config.py

@@ -16,7 +16,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA  02110-1301, USA.
 
-"""Tests for reading and writing configuraiton files."""
+"""Tests for reading and writing configuration files."""
 
 from cStringIO import StringIO
 from dulwich.config import (