Cautioned against multi-level relative imports in coding style docs.

docs/internals/contributing/writing-code/coding-style.txt

@@ -150,8 +150,9 @@ Imports
   other Django components, local Django component, try/excepts. Sort lines in
   each group alphabetically by the full module name. Place all
   ``import module`` statements before ``from module import objects`` in each
-  section. Use absolute imports for other Django components and relative
-  imports for local components.
+  section. Use absolute imports for other Django components and a one-dot
+  relative import (``from .foo import Bar``) for local components. Avoid
+  multi-dot relative imports.
 
 * On each line, alphabetize the items with the upper case items grouped before
   the lowercase items.