Relax __all__ location.

Put all module level dunders together in the same location, and remove
the redundant version bookkeeping information.

Closes #27187.  Patch by Ian Lee.

pep-0008.txt

@@ -365,8 +365,6 @@ Imports
 
   You should put a blank line between each group of imports.
 
-  Put any relevant ``__all__`` specification after the imports.
-
 - Absolute imports are recommended, as they are usually more readable
   and tend to be better behaved (or at least give better error
   messages) if the import system is incorrectly configured (such as
@@ -415,6 +413,14 @@ Imports
   public and internal interfaces still apply.
 
 
+Dunder Variables
+----------------
+
+All relevant dunder variables (e.g. ``__all__``, ``__author__``,
+``__version__``, etc) should be placed after the module docstring and
+before any imports, separated by a blank line above and below.
+
+
 String Quotes
 =============
 
@@ -689,19 +695,6 @@ Conventions for writing good documentation strings
   the same line.
 
 
-Version Bookkeeping
-===================
-
-If you have to have Subversion, CVS, or RCS crud in your source file,
-do it as follows. ::
-
-    __version__ = "$Revision$"
-    # $Source$
-
-These lines should be included after the module's docstring, before
-any other code, separated by a blank line above and below.
-
-
 Naming Conventions
 ==================