Remove the "built-in objects" file. It only contained two paragraphs of which…

Remove the "built-in objects" file.  It only contained two paragraphs of which only one contained useful information, which belongs in the ref manual however.

Doc/library/index.rst

@@ -43,7 +43,6 @@ the `Python Package Index <http://pypi.python.org/pypi>`_.
    intro.rst
    functions.rst
    constants.rst
-   objects.rst
    stdtypes.rst
    exceptions.rst
 

Doc/library/objects.rst

-
-.. _builtin:
-
-****************
-Built-in Objects
-****************
-
-.. index::
-   pair: built-in; types
-   pair: built-in; exceptions
-   pair: built-in; functions
-   pair: built-in; constants
-   single: symbol table
-
-Names for built-in exceptions and functions and a number of constants are found
-in a separate  symbol table.  This table is searched last when the interpreter
-looks up the meaning of a name, so local and global user-defined names can
-override built-in names.  Built-in types are described together here for easy
-reference.
-
-The tables in this chapter document the priorities of operators by listing them
-in order of ascending priority (within a table) and grouping operators that have
-the same priority in the same box. Binary operators of the same priority group
-from left to right. (Unary operators group from right to left, but there you
-have no real choice.)  See :ref:`operator-summary` for the complete picture on
-operator priorities.
-