Fix typos and a stale model reference in the docs

[Oke Iyanuoluwa Enoch (Iyanuoluwa007)]

Describe your changes

Fixes the documentation typos and inaccuracies listed in the codebase review (#2516), plus two more found with codespell:

• README.md: "the the", "documentd".
• notebooks/README.md: "ocmmand", "hot wo".
• docs/source/how-to/index.md: the CLI command is capture-onnx-graph, not onnx-graph-capture. The list now puts optimize first instead of the deprecated auto-opt.
• docs/source/getting-started/getting-started.md:
  • The text said the optimize example downloads Llama-3.2-1B-Instruct, but the command right below uses Qwen/Qwen2.5-0.5B-Instruct. The text now names the right model.
  • Fixed the grammar ("and optimizing the graph").
  • Dropped the fixed "around 60secs" estimate, since the run time depends on the hardware.
• docs/source/features/onnx-transformations.md: "atleast".
• docs/source/features/quantization.md: "simlar".

Docs only, no code changes. codespell reports nothing on README.md, notebooks/README.md and docs/source after this change.

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.

(Optional) Issue link

Part of #2516

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[Copilot]

🟢 Approval recommended

The documentation-only corrections match their context and leave no unresolved review findings.

No open issues 🎉

What changed in this PR

Corrects Olive documentation typos and outdated references, addressing part of #2516 without changing code.

Changes:

• Fixes spelling errors across READMEs and feature documentation.
• Corrects the CLI command list and prioritizes optimize.
• Aligns the getting-started model description with its example and removes the fixed runtime estimate.

File	Description
README.md	Fixes spelling and duplicated wording.
notebooks/​README.md	Corrects notebook link descriptions.
docs/​source/​how-to/​index.md	Updates CLI command names and ordering.
docs/​source/​getting-started/​getting-started.md	Corrects the model reference, grammar, and runtime guidance.
docs/​source/​features/​quantization.md	Fixes spelling in the SpinQuant description.
docs/​source/​features/​onnx-transformations.md	Corrects “at least” in transformation documentation.

_{Review effort: Balanced}