Created using [mini-swe-agent](https://mini-swe-agent.com) and the propmt:
I'd like to find usages of PYBIND11_MODULE in the docs folder and add py::mod_gil_not_used() as a third argument if there ar
e only two arguments. These are examples, and it's really a good idea to always include that now.
I removed a few of the changes.
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>