Fix Products.Zope_Hotfix_20110622 note according to pypi page.

https://pypi.python.org/pypi/Products.Zope_Hotfix_20110622 says:

    Any version of Zope 2.10 or Zope 2.11 where PloneHotfix20110720 is installed (Plone 3.0, 3.1, 3.2 and 3.3 <= 3.3.5).