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

[vadmium+py at gmail.com]

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

https://bugs.python.org/review/20842/diff/17723/Doc/library/pkgutil.rst#newcode49
Doc/library/pkgutil.rst:49: :term:`importer` that wraps Python's
"classic" import algorithm.
Please start paragraphs and sentences with capital letters

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