As of 2016-09-25, there is no ideal solution.
The WP-Parser does the job, but you need to set up a special WP site to run it.
WooCommerce’s Hook-docs is something much simpler, and can be easily tweaked.
I just wrote a long comment on the topic here:
https://github.com/ApiGen/ApiGen/issues/307#issuecomment-249349187