Add SUMO-RL as example project in the docs

[LucasAlegre]

Description

Added SUMO-RL (https://github.com/LucasAlegre/sumo-rl) as example project in the docs

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

Checklist:

• I've read the CONTRIBUTION guide (required)
• I have updated the changelog accordingly (required).
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
• I have reformatted the code using make format (required)
• I have checked the codestyle using make check-codestyle and make lint (required)
• I have ensured make pytest and make type both pass. (required)
• I have checked that the documentation builds using make doc (required)

Note: You can run most of the checks using make commit-checks.

Note: we are using a maximum length of 127 characters per line

[araffin]

Hello,

Thank you for your PR, please don't forget to do all the required steps in the checklist ;)

[araffin]

Thank you for your PR, please don't forget to do all the required steps in the checklist ;)

If you check an item in the checklist, you must DO it first ;)

[araffin]

Please revert this, docstrings are right after the constructor for the automatic documentation

[LucasAlegre]

But it was giving an error when running "make-doc". Now it is like all other classes.

[araffin]

That should not be the case, the doc is building at least with continuous integration, see https://github.com/DLR-RM/stable-baselines3/runs/1533347883

See current doc too: https://stable-baselines3.readthedocs.io/en/master/common/atari_wrappers.html

[LucasAlegre]

The error I found before was because it was written "frame_skip::" instead of "frame_skip:" (with only one ":").
Now I fixed the docs of all the other classes in the file too.

[LucasAlegre]

Thank you for your PR, please don't forget to do all the required steps in the checklist ;)

If you check an item in the checklist, you must DO it first ;)

Sorry! I thought some of them were not necessary as I had not changed code files.

Now I believe everything is passing! :)

[araffin]

LGTM, thanks =)

[LucasAlegre]

LGTM, thanks =)

Thank you! And sorry for the trouble with the checklist.

By the way, I'm working on a PyTorch version of Model-Based Policy Optimization (MBPO) reusing SAC from sb3.
Perhaps I can add it to stable-baselines3-contrib when I'm done.

Cheers