Fix typo: add missing preposition 'on' in documentation

[Look001122]

Corrected a grammatical error in the semantic segmentation section.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9412

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❌ 6 New Failures, 2 Unrelated Failures

As of commit 598a8f2 with merge base 4729419 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/vision / build-wheel-py3_10-cuda12_6 (gh)
  RuntimeError: Error compiling objects for extension
• Build Windows Wheels / pytorch/vision / build-wheel-py3_10-cuda12_8 (gh)
  RuntimeError: Error compiling objects for extension
• Build Windows Wheels / pytorch/vision / build-wheel-py3_10-cuda13_0 (gh)
  RuntimeError: Error compiling objects for extension
• Build Windows Wheels / pytorch/vision / upload / upload-wheel-py3_10-cuda13_0 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_vision__3.10_cu130_x64
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
  test/test_internet.py::TestDatasetUtils::test_download_url_dispatch_download_from_google_drive[False]
• Tests / unittests-windows (3.14, windows.4xlarge, cpu) / windows-job (gh)
  test/test_internet.py::TestDatasetUtils::test_download_url_dispatch_download_from_google_drive[False]

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/vision / upload / upload-wheel-py3_10-cuda12_6 (gh) (trunk failure)
• Build Windows Wheels / pytorch/vision / upload / upload-wheel-py3_10-cuda12_8 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_vision__3.10_cu128_x64

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[zy1git]

@Look001122 Thanks for fixing this typo!

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