Updated docstrings

[BolunDai0216]

Description

Updated the docstrings for environments.

Type of change

New feature (non-breaking change which adds functionality)

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

You should be able to add the warning message to the list of ignored message or wait for about week (it might be sooner) until the next gymnasium release which will fix it

[BolunDai0216]

You should be able to add the warning message to the list of ignored message or wait for about week (it might be sooner) until the next gymnasium release which will fix it

can this be merged now?

[pseudo-rnd-thoughts]

Let me know if you want to make a release for miniworld