Fix more typos and broken links

[abhinaykukkadapu]

As in title giving one last pass before we bulk pull the docs to release.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15331

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❌ 1 New Failure, 111 Pending

As of commit f80a245 with merge base 455639b ():

NEW FAILURE - The following job has failed:

• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

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