docs: fix Vale heading case errors in gRPC async client docs

[ramakrishnap-nv]

Summary

Fixes three heading case errors flagged by the Vale prose linter (added in #1668) in docs that were merged in #1653 before Vale was introduced.

• python-async-client-api.rst: See also → See Also
• index.rst: When to choose which path → When to Choose Which Path
• python-async-client.rst: Next steps → Next Steps

These errors are currently blocking check-style on every open PR.

Testing

Pre-commit passes on all three files.

Docs

Heading text only — no content change.

[ramakrishnap-nv]

/merge

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 2ab2028a-57d7-42e1-8780-dfe5d268c459

📥 Commits

Reviewing files that changed from the base of the PR and between 9eefd80 and 5b737c3.

📒 Files selected for processing (3)

• docs/cuopt/source/cuopt-grpc/index.rst
• docs/cuopt/source/cuopt-grpc/python-async-client-api.rst
• docs/cuopt/source/cuopt-grpc/python-async-client.rst

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📝 Walkthrough

Walkthrough

Three gRPC documentation headings now use title-case capitalization.

Changes

gRPC documentation heading capitalization

Layer / File(s)	Summary
Standardize section headings docs/cuopt/source/cuopt-grpc/*.rst	Updated “When to Choose Which Path,” “See Also,” and “Next Steps” headings.
Estimated code review effort: 1 (Trivial)	~2 minutes

Possibly related PRs

• NVIDIA/cuopt#1668: Applies the title-case convention to headings in the same documentation tree.

Suggested labels: doc

Suggested reviewers: iroy30, tmckayus

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the heading case fixes in the gRPC async client documentation.
Description check	✅ Passed	The description directly explains the three heading case fixes, their purpose, testing, and documentation scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/vale-heading-case

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[github-actions]

CI Test Summary

✅ All 31 test job(s) passed.