[sr-dev] Re: [kamailio/kamailio] pike: fix documentation for reqs_density_per_unit (PR #3806)

@tsearle

After reading the documentation [here](https://www.kamailio.org/docs/modules/devel/modules/pike.html#idm153), specifically Chapter 3. Development Guide, and a bit of code reading regarding this module, it's seems that current documentation is correct.

Internally, pike module uses a tree structure to create nodes with parts of the IPs and if multiple are coming from the same subset they will be blocked faster (minimum reqs_density_per_unit hits though) and others coming from different subnet **_might_** require up to 3x or 9x hits (IPv4/IPv6 respectively).

I will double check that the rest documentation is up to date though.