docs: fix heading levels

[Planeshifter]

Description

What is the purpose of this pull request?

This pull request:

• changes ## Notes to ### Notes in the C APIs section of eight napi READMEs, so the heading nests under ## C APIs like the existing ### Usage subsection.

Namespace summary. @stdlib/napi has 53 members and none are autogenerated. Seven structural features were analyzed: file tree, package.json keys, package.json scripts/stdlib keys, manifest.json keys, keywords, README sections, and test/benchmark/example file names. Every feature has a clear majority (at least 75%). The JS sources (lib/main.js, lib/index.js, lib/browser.js) are identical across all 53 packages apart from the package name, so they show no semantic drift.

napi/argv-complex128array, napi/argv-complex64array, napi/argv-int32, napi/argv-int64, napi/argv-strided-complex128array, napi/argv-strided-complex64array, napi/argv-uint32, napi/argv-uint64

The C API notes heading was at level two, which takes it out of the ## C APIs section. ### Usage sits at level three in 100% of napi siblings. Across stdlib, READMEs with a C APIs section use ### Notes for C API notes in 74 of 82 cases, and these eight packages are the remaining 8. This is a one-line heading change per package and does not change any content.

Related Issues

Does this pull request have any related issues?

No.

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Validation. Structural features were extracted for all 53 packages. The JS sources were compared by normalized content hash. Each candidate was then reviewed for structural applicability and checked against tooling and docs that reference it. Remark lint rules check <section> classes, not heading depth. Nothing links to these #notes anchors, and the JS notes sections are untouched.

Deliberately excluded:

• napi/argv and napi/export lack binding.gyp, include.gypi, src/, lib/native.js, gypfile and directories.src. They are header-only macro packages, so this is intentional.
• napi/argv-dataview-cast lacks src/main.c. It is header-only (its manifest has an empty src), so this is intentional.
• napi/export is missing the utilities and utils keywords. This was dropped because it is a low-materiality metadata-only change.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

This PR was written primarily by Claude Code as part of an automated cross-package drift-detection run.

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🤖 Generated with Claude Code

https://claude.ai/code/session_01ChU3fyfvjayXEWk3ZKbg5i

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
napi/argv-complex128array	$\\color{green}156/156$ $\\color{green}+100.00\\%$	$\\color{green}8/8$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}156/156$ $\\color{green}+100.00\\%$
napi/argv-complex64array	$\\color{green}156/156$ $\\color{green}+100.00\\%$	$\\color{green}8/8$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}156/156$ $\\color{green}+100.00\\%$
napi/argv-int32	$\\color{green}146/146$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}146/146$ $\\color{green}+100.00\\%$
napi/argv-int64	$\\color{green}146/146$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}146/146$ $\\color{green}+100.00\\%$
napi/argv-strided-complex128array	$\\color{green}156/156$ $\\color{green}+100.00\\%$	$\\color{green}8/8$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}156/156$ $\\color{green}+100.00\\%$
napi/argv-strided-complex64array	$\\color{green}156/156$ $\\color{green}+100.00\\%$	$\\color{green}8/8$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}156/156$ $\\color{green}+100.00\\%$
napi/argv-uint32	$\\color{green}146/146$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}146/146$ $\\color{green}+100.00\\%$
napi/argv-uint64	$\\color{green}146/146$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}146/146$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.