docs: Include actual links to tox/pythonbrew in documentation
docs: Include actual links to tox/pythonbrew in documentation

michaelcho/python-devicecloud,brucetsao/python-devicecloud,ctrlaltdel/python-devicecloud,digidotcom/python-devicecloud,brucetsao/python-devicecloud,ctrlaltdel/python-devicecloud,michaelcho/python-devicecloud,digidotcom/python-devicecloud