Fixed typo in docs

Nurdok · Nurdok · commit a8f56e6e46bb · 2015-10-02T23:58:17.000+03:00
diff --git a/docs/error_codes.rst b/docs/error_codes.rst
@@ -14,4 +14,4 @@ Not all error codes are checked for by default. The default behavior is to
 check only error codes that are part of the `PEP257
 <http://www.python.org/dev/peps/pep-0257/>`_ official convention.
 
-All off the above error codes are checked for by default except D203.
+All of the above error codes are checked for by default except for D203.
