Fix documentation link for Core ATen operators

[mergennachin]

Updated link to Core ATen operator set documentation.

Summary

[PLEASE REMOVE] See CONTRIBUTING.md's Pull Requests for ExecuTorch PR guidelines.

[PLEASE REMOVE] If this PR closes an issue, please add a Fixes #<issue-id> line.

[PLEASE REMOVE] If this PR introduces a fix or feature that should be the upcoming release notes, please add a "Release notes: " label. For a list of available release notes labels, check out CONTRIBUTING.md's Pull Requests.

Test plan

[PLEASE REMOVE] How did you test this PR? Please write down any manual commands you used and note down tests that you have written if applicable.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15050

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⏳ No Failures, 114 Pending

As of commit b846198 with merge base 1a8acf6 ():
💚 Looks good so far! There are no failures yet. 💚

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[github-actions]

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[psiddh]

@pytorchbot cherry-pick --onto release/1.0 -c docs

[pytorchbot]

Cherry picking #15050

Command git -C /home/runner/work/executorch/executorch cherry-pick -x -X theirs 9560800207b61103835c209b8f65819c6be2b935 returned non-zero exit code 1

Auto-merging README.md
The previous cherry-pick is now empty, possibly due to conflict resolution.
If you wish to commit it anyway, use:

    git commit --allow-empty

Otherwise, please use 'git cherry-pick --skip'
On branch cherry-pick-15050-by-pytorch_bot_bot_
You are currently cherry-picking commit 9560800207.
  (all conflicts fixed: run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

nothing to commit, working tree clean

Details for Dev Infra team

Raised by workflow job