Elaborate in the wps docs about configuration

## Description

The template docs could need more hints for the user. See some updates examples:

* https://github.com/bird-house/hummingbird/pull/25/files
* https://github.com/bird-house/malleefowl/pull/39/files

## Environment

* Cookiecutter version used, if any: 0.3.1
* Python version, if any:
* Operating System:

## Steps to Reproduce

## Additional Information
