Make PEP 8 follow PEP 257 on docstring endings.

pep-0008.txt

@@ -545,14 +545,14 @@ Conventions for writing good documentation strings
 
 - PEP 257 describes good docstring conventions.  Note that most
   importantly, the ``"""`` that ends a multiline docstring should be
-  on a line by itself, and preferably preceded by a blank line, e.g.::
+  on a line by itself, e.g.::
 
       """Return a foobang
 
       Optional plotz says to frobnicate the bizbaz first.
       """
 
-- For one liner docstrings, it's okay to keep the closing ``"""`` on
+- For one liner docstrings, please keep the closing ``"""`` on
   the same line.