warnings framework documentation

[freddrake]

BPO	225933
Nosy	@gvanrossum, @freddrake

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = 'https://github.com/gvanrossum' closed_at = created_at = labels = ['type-feature', 'docs'] title = 'warnings framework documentation' updated_at = user = 'https://github.com/freddrake' ``` bugs.python.org fields: ```python activity = actor = 'gvanrossum' assignee = 'gvanrossum' closed = True closed_date = None closer = None components = ['Documentation'] creation = creator = 'fdrake' dependencies = [] files = [] hgrepos = [] issue_num = 225933 keywords = [] message_count = 2.0 messages = ['2691', '2692'] nosy_count = 2.0 nosy_names = ['gvanrossum', 'fdrake'] pr_nums = [] priority = 'high' resolution = 'fixed' stage = None status = 'closed' superseder = None type = 'enhancement' url = 'https://bugs.python.org/issue225933' versions = [] ```

[freddrake]

The PyWarn_*() APIs need to be documented: Doc/api/api.tex.

The command line parameters need to be documented: Misc/python.man.

The Python module needs to be documented: Doc/lib/libwarnings.tex (new file to create).

[gvanrossum]

All done.