[docs] Improve cross-references in builtins documentation. (issue 19190)

[georg at python.org]

http://bugs.python.org/review/19190/diff/9471/Doc/glossary.rst
File Doc/glossary.rst (right):

http://bugs.python.org/review/19190/diff/9471/Doc/glossary.rst#newcode419
Doc/glossary.rst:419: :meth:`~iterator.__next__` method just raise
:exc:`StopIteration` again.
unneeded

http://bugs.python.org/review/19190/diff/9471/Doc/library/functions.rst
File Doc/library/functions.rst (right):

http://bugs.python.org/review/19190/diff/9471/Doc/library/functions.rst#newcode545
Doc/library/functions.rst:545: 
unrelated change

http://bugs.python.org/review/19190/diff/9471/Doc/library/functions.rst#newcode1406
Doc/library/functions.rst:1406: or any other object with a
:attr:`~object.__dict__` attribute.
unneeded, etc. below

http://bugs.python.org/review/19190/diff/9471/Doc/library/numbers.rst
File Doc/library/numbers.rst (right):

http://bugs.python.org/review/19190/diff/9471/Doc/library/numbers.rst#newcode160
Doc/library/numbers.rst:160: :meth:`__add__`.  (Or ``A`` may not
implement :meth:`__add__` at
unrelated change

http://bugs.python.org/review/19190/diff/9471/Doc/library/stdtypes.rst
File Doc/library/stdtypes.rst (right):

http://bugs.python.org/review/19190/diff/9471/Doc/library/stdtypes.rst#newcode343
Doc/library/stdtypes.rst:343: :mod:`math` module for well-defined
conversions.
leave out ~, remove "in the math module"

http://bugs.python.org/review/19190/diff/9471/Doc/library/stdtypes.rst#newcode637
Doc/library/stdtypes.rst:637: made available to Python as the
:attr:`~sys.hash_info.modulus` attribute of
leave out tilde, remove "of sys.hash_info"

http://bugs.python.org/review/19190/diff/9471/Doc/library/stdtypes.rst#newcode3361
Doc/library/stdtypes.rst:3361: :attr:`~object.__dict__` attribute is not
possible (you can write
unneeded

http://bugs.python.org/review/19190/diff/9471/Doc/reference/datamodel.rst
File Doc/reference/datamodel.rst (right):

http://bugs.python.org/review/19190/diff/9471/Doc/reference/datamodel.rst#newcode607
Doc/reference/datamodel.rst:607: body of the function:  calling the
iterator's :meth:`iterator.__next__`
good catch :)

http://bugs.python.org/review/19190/