Fix typos in docs ahead of GA

[abhinaykukkadapu]

Fix typos and grammatical issues in docs ahead of the release.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14964

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 37 Pending

As of commit 334e23c with merge base f443ebb ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4c837dbfc89e2cefb0754334cc0bfda2d3d4a80cb3133610aba9f1852af7d849 /exec failed with exit code 1

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[github-actions]

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[abhinaykukkadapu]

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

[pytorchbot]

Cherry picking #14964

The cherry pick PR is at #14969 The following tracker issues are updated:

• [v1.0.0] Release Tracker #14288 (comment)

Details for Dev Infra team

Raised by workflow job

[psiddh]

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

[pytorchbot]

Cherry picking #14964

Command git -C /home/runner/work/executorch/executorch cherry-pick -x -X theirs fc512faa2f46687a8cb4ef87982ad26c30198685 returned non-zero exit code 1

Auto-merging docs/README.md
Auto-merging docs/source/backends-coreml.md
Auto-merging docs/source/getting-started-architecture.md
Auto-merging docs/source/getting-started.md
Auto-merging docs/source/running-a-model-cpp-tutorial.md
Auto-merging docs/source/using-executorch-android.md
Auto-merging docs/source/using-executorch-troubleshooting.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-14964-by-pytorch_bot_bot_
You are currently cherry-picking commit fc512faa2f.
  (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