[BugFix] Fix documentation of threads for batched envs.

[skandermoalla]

Shouldn't it be this instead?

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/1776

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✅ You can merge normally! (11 Unrelated Failures)

As of commit 0fccdbe with merge base 1874e9a ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Build M1 Wheels / pytorch/rl / wheel-py3_8-cpu (gh)
  ImportError: cannot import name 'MemoryMappedTensor' from 'tensordict' (/Users/ec2-user/runner/_work/_temp/conda_environment_7448646073/lib/python3.8/site-packages/tensordict/__init__.py)
• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
  test/test_libs.py::TestOpenML::test_env[batch_size0-mushroom_onehot]
• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
  test/test_libs.py::TestOpenML::test_env[batch_size0-mushroom_num]
• Unit-tests on Linux CPU / tests (3.9) / linux-job (gh)
  test/test_libs.py::TestOpenML::test_env[batch_size0-shuttle]
• Unit-tests on Windows / unittests-cpu / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

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

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

• Habitat Tests on Linux / tests (3.9, 11.6) / linux-job (gh)
  test/test_libs.py::TestHabitat::test_habitat_render[False-HabitatPick-v0]
• Unit-tests on Linux CPU / tests (3.11) / linux-job (gh)
  test/test_libs.py::TestOpenML::test_env[batch_size0-mushroom_num]
• Unit-tests on Linux GPU, latest stable release / tests (3.8, 11.8) / linux-job (gh)
  test/test_libs.py::TestOpenML::test_env[batch_size0-magic]
• Unit-tests on Windows / unittests-gpu / windows-job (gh)
  ##[error]The operation was canceled.

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[vmoens]

LGTM