drm/atomic: Unconfuse the old_state mess in commmit_tail

I totally butcherd the job on typing the kernel-doc for these, and no
one realized. Noticed by Russell. Maarten has a more complete approach
to this confusion, by making it more explicit what the new/old state
is, instead of this magic switching behaviour.

v2:
- Liviu pointed out that wait_for_fences is even more magic. Leave
that as @state, and document @pre_swap better.
- While at it, patch in header for the reference section.
- Fix spelling issues Russell noticed.

v3: Fix up the @pre_swap note (Liviu): Also s/synchronous/blocking/,
since async flip is something else than non-blocking.

Cc: Liviu Dudau <[email protected]>
Reported-by: Russell King - ARM Linux <[email protected]>
Cc: Russell King - ARM Linux <[email protected]>
Fixes: 9f2a7950e77a ("drm/atomic-helper: nonblocking commit support")
Cc: Gustavo Padovan <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Tomeu Vizoso <[email protected]>
Cc: Daniel Stone <[email protected]>
Reviewed-by: Liviu Dudau <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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