Since this is a second round review, I'm going to trim more heavily.
Perhaps worth a comma at the end of this line?
> +# Git Hook scripts
> +Gitano administrators may create, or delegate creation of
> +[Lua][lua] scripts to take action or provide further authentication
> +when content is pushed to a repository.
> +5. The `refname`, `oldsha` and `newsha` as the third to fifth parameters...second to fourth...
> +6. For pre-receive or post-receive per-repository hooks as the third parameter,
> +7. Global hooks work the same as per-repository hooks,...except they are passed a callable function first, followed by the positional
> + except their first parameter is instead a callable function
> + which will run the per-repository hook when called,
> + so global hooks may either replace or augment per-repository hooks.
parameters as described above. The callable will run the per-repository
hook when called, ...
Otherwise I think it looks good.
If you're ok with the above changes, and don't think I've missed anything,
then I'm happy to apply these as part of a merge.