error in doc: wrong module name for distutils.errors

Issue #182 resolved
Zooko O'Whielacronx
created an issue

http://packages.python.org/distribute/setuptools.html#adding-setup-arguments

says:

It should raise a DistutilsSetupError (from the distutils.error module) if the argument is invalid.

but the module name is distutils.errors not distutils.error.