MuJoCo/Ant clarify the lack of use_contact_forces on v3 (and older)

[Kallinteris-Andreas]

Description

clarifies the fact that use_contact_forces does not exist on previous versions

Downside: it increases the complexity of the DOC for people not interested in v3 or older

Fixes # (issue)

Type of change

• DOC CHANGE

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• [DOES NOT APPLY] I have commented my code, particularly in hard-to-understand areas
• [DOES NOT APPLY] I have made corresponding changes to the documentation
• [[DOES NOT APPLY] My changes generate no new warnings
• [[DOES NOT APPLY] I have added tests that prove my fix is effective or that my feature works
• [DOES NOT APPLY] New and existing unit tests pass locally with my changes

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Name	Status	Preview	Comments	Updated
gymnasium	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 21, 2023 at 1:57PM (UTC)