Revise ethos doc links in CMakeLists.txt

[psiddh]

Updated documentation links for Ethos-U memory modes.

[pytorch-bot]

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⏳ 78 Pending, 2 Unrelated Failures

As of commit f437735 with merge base cedfe4c ():

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

• Test Metal Backend / export-model-metal-artifact (openai, whisper-small, non-quantized) / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist
• Test Metal Backend / test-metal-backend-modules / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist

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[Copilot]

Pull request overview

Updates the Ethos-U memory-modes documentation references in the Arm image classification runtime CMake configuration to point to newer/stable docs, while retaining a link to the 1.0 docs for compatibility.

Changes:

• Replaced the previous stable Ethos-U memory modes link with an updated “stable” URL.
• Added an additional URL pointing to the 1.0 documentation for compatibility reference.

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[Copilot]

Pull request overview

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[GregoryComer]

Does it make sense to add a redirect? I'll defer to your judgement, just thinking out loud.

[zingo]

Hi @psiddh / @GregoryComer I don't think this made it into 1.2 releaase branch as it was taken already the 10:th should it?