Minor docu updates wrt GUI

• /doc/source/user_guide/tutorials/10_scenario_simulation.rst
• /doc/source/user_guide/tutorials/20_pcm_simulation.rst
• /doc/source/index.rst

Closes #255 (closed) and #256 (closed)

The program was tested solely for our own use cases, which might differ from yours.

Jan Dobberstein jan.dobberstein@mercedes-benz.com on behalf of Mercedes-Benz Tech Innovation GmbH, Provider Information