docs: restore section template comments in ndarray/base/diagonal and ndarray/last

[Planeshifter]

Description

Follow-up fixes for commits merged to develop between c2b92b4 (2026-05-02 18:43:33 -0700) and 186eaa37 (2026-05-03 04:42:10 -0700).

This pull request:

• ndarray/base/diagonal: Fixes ndarray/base/diagonal README (632bef35) which omitted the five boilerplate section-separator HTML comments required before each top-level <section>, present in sibling packages such as ndarray/base/rot90.
• ndarray/last: Fix truncated intro-section template comment in lib/node_modules/@stdlib/ndarray/last/README.md introduced in 9e8bb89b; restores the canonical wording (...intro \section` element and another before the `/section` close.`) consistent with all sibling packages.

Related Issues

No.

Questions

No.

Other

Validation audit of the 18 commits merged to develop in the past 24 hours (range c2b92b4..186eaa37):

• Checked: stdlib code style compliance against docs/style-guides; objective bug scan over the union diff and the introduced code in the new packages (blas/base/ndarray/cswap, blas/base/ndarray/zswap, ndarray/base/diagonal, ndarray/base/reverse-dimensions, ndarray/last); follow-up fixes in the stats/strided/dpcorr chain.
• Excluded: subjective concerns, "could be" issues, anything requiring out-of-window changes, anything already addressed by the in-window bench: refactor to use string interpolation in utils, style: resolve lint error in ndarray/fancy, and chore: propagate fixes to sibling packages commits.
• Result: only the two README template-comment fixes above survived multi-agent corroboration and re-verification against the diff and reference siblings.

Checklist

• Read, understood, and followed the contributing guidelines.

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

This PR was authored by Claude Code as part of an automated review of commits merged to develop in the past 24 hours. Style-compliance and bug-scan agents inspected the union diff; only findings corroborated by re-reading the diff against reference siblings were applied.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
ndarray/base/diagonal	$\color{green}188/188$ $\color{green}+100.00%$	$\color{green}22/22$ $\color{green}+100.00%$	$\color{green}1/1$ $\color{green}+100.00%$	$\color{green}188/188$ $\color{green}+100.00%$
ndarray/last	$\color{green}249/249$ $\color{green}+100.00%$	$\color{green}27/27$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}249/249$ $\color{green}+100.00%$

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