Documentation needs to be updated to include other captcha methods

[smac89]

In the docs, it says that only Google's recaptcha is supported, however the latest configuration file shows that in addition to recaptcha, hcaptcha and turnstile are also supported.

[LaurenceJJones]

Its has been added to next

https://doc.crowdsec.net/docs/next/bouncers/nginx#setup-captcha