[Doc] MADDPG bug fix of buffer device and improve explaination

[matteobettini]

Fix #2515

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2519

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 5 Unrelated Failures

As of commit b9dd0b7 with merge base a70b258 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  ##[error]Workflow failed! Resource not accessible by integration
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  ##[error]Workflow failed! Resource not accessible by integration
• Habitat Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 8f42251210bb3bd7c83b08b3152cc5d6978b6bf7742e466fc0543359cc6da2de /exec failed with exit code 134

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cpu (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda11_8 (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda12_1 (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Wheels / pytorch/rl / upload / wheel-py3_9-cuda12_4 (gh) (trunk failure)
  ##[error]Unable to find any artifacts for the associated workflow
• Unit-tests on Windows / unittests-cpu / windows-job (gh) (trunk failure)
  ##[error]Process completed with exit code 1.

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[vmoens]

LGTM thanks for this