[docs] pkgutil docs should reference glossary terms not PEP 302 (issue 20842)

[vadmium+py at gmail.com]

http://bugs.python.org/review/20842/diff/17723/Doc/library/pkgutil.rst
File Doc/library/pkgutil.rst (right):

http://bugs.python.org/review/20842/diff/17723/Doc/library/pkgutil.rst#newcode51
Doc/library/pkgutil.rst:51: If *dirname* is a string, a :term:`importer`
is created that searches that
IMO it is detrimental linking the same term over and over. Once per
section of text would be better.

http://bugs.python.org/review/20842/