Don't rely on hash sorting for docs examples

Author: gazpachoking

docs/errors.rst

@@ -62,7 +62,7 @@ These attributes can be clarified with a short example:
     ... }
     >>> instance = [{}, 3, "foo"]
     >>> v = Draft4Validator(schema)
-    >>> errors = list(v.iter_errors(instance))
+    >>> errors = sorted(v.iter_errors(instance), key=lambda e: e.path)
 
 The error messages in this situation are not very helpful on their own:
 
@@ -103,7 +103,7 @@ the schema each of these errors come from. In the case of sub-errors from the
 .. code-block:: python
 
     >>> for e in errors:
-    ...     for sube in e.context:
+    ...     for sube in sorted(e.context, key=lambda e: e.schema_path:
     ...         print list(sube.schema_path), sube
     [0, 'type'] {} is not of type 'string'
     [1, 'type'] {} is not of type 'integer'