metaclasses and 2.2 highlights

[91e69f45-91d9-4b12-87db-a02908296c81]

BPO	515137
Nosy	@freddrake, @brettcannon

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GitHub fields: ```python assignee = 'https://github.com/freddrake' closed_at = created_at = labels = ['docs'] title = 'metaclasses and 2.2 highlights' updated_at = user = 'https://bugs.python.org/phr' ``` bugs.python.org fields: ```python activity = actor = 'brett.cannon' assignee = 'fdrake' closed = True closed_date = None closer = None components = ['Documentation'] creation = creator = 'phr' dependencies = [] files = [] hgrepos = [] issue_num = 515137 keywords = [] message_count = 2.0 messages = ['9204', '9205'] nosy_count = 3.0 nosy_names = ['fdrake', 'brett.cannon', 'phr'] pr_nums = [] priority = 'normal' resolution = 'wont fix' stage = None status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue515137' versions = ['Python 2.2'] ```

[91e69f45-91d9-4b12-87db-a02908296c81]

The 2.2 highlights list at python.org doesn't mention metaclasses. Maybe they're considered part of the type/class unification but I didn't notice them til reading some old c.l.py articles about class design. I think they're an important enough addition that they should be mentioned in the highlights. --phr

[brettcannon]

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Closing this and rejecting it since things about web pages should be sent to webmaster@python.org and not here.