Minor contributor documentation changes (#2729)

## Changes

This PR makes some minor changes to the the contributor documentation:

- Hatch/env setup tweak to keep IntelliJ/PyCharm happy. (For some reason
if the full path isn't specified IntelliJ can have problems locating the
python interpreter for the venv.)
 - ~Add in the linting step.~

Author: asnare

CONTRIBUTING.md

@@ -259,7 +259,7 @@ make dev
 
 To use different python version, specify it in `HATCH_PYTHON` variable:
 ```shell
-HATCH_PYTHON=python3.10 make clean dev test
+HATCH_PYTHON="$(which python3.10)" make clean dev test
 ```
 
 Configure your IDE to use `.venv/bin/python` from the virtual environment when developing the project: