hooks/docs: Fix 1.0.0 Nvidia example (adding version, etc.)

Reported by Gary Edwards [1].  Both typos are originally from 68eb128f
(pkg/hooks: Version the hook structure and add 1.0.0 hooks,
2018-04-27, #686).

[1]: https://github.com/projectatomic/libpod/issues/884#issuecomment-394174571

Signed-off-by: W. Trevor King <wking@tremily.us>

Closes: #887
Approved by: rhatdan
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