In documentation please include header file

[lfmunoz]

Title explains issue, but for example:

https://github.com/catchorg/Catch2/blob/devel/docs/generators.md

Copy paste trying learn how it works, but unfortunately I have to figure out which file to include.

Apparently it is #include <catch2/generators/catch_generators.hpp>

Makes it hard to follow or quickly build something, would be very helpful if you link to hpp file needed for the examples shown.