Fix set_state, unset_state typos in doc.  Add TOC to graphics chapter.
Fix set_state, unset_state typos in doc.  Add TOC to graphics chapter.

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extra : convert_revision : svn%3A14d46d22-621c-0410-bb3d-6f67920f7d95/trunk%401976

infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore