docs: fix examples and notes

[Planeshifter]

Description

What is the purpose of this pull request?

Follow-up fixes for commits merged to develop between 2026-10-13 15:26 UTC (abeb4a5) and 2026-10-14 12:12 UTC (5dbad73).

This pull request:

• array/uint64: Remove unused var Uint64 = require( '@stdlib/number/uint64/ctor' ); from the entries() example in array/uint64 (README.md and lib/main.js), left dead after acc3ee3 switched the example to new Uint64Array( [ 1, 2, 3 ] ).
• blas/ext/base/ndarray/gediff: Fix prepend/append docs in blas/ext/base/ndarray/gediff/README.md (introduced in 0eb422d): the values are added to the output after computing differences, not "prior to", consistent with the implementation, the README example output ([1,2,2,2,2,11]), and the strided blas/ext/base/gediff docs.

Related Issues

Does this pull request have any related issues?

None.

Questions

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No.

Other

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Validation

• Reviewed 33 first-parent commits to develop in the window (fixtures, generated SVGs, and REPL data excluded).
• Checked style-guide compliance against reference sibling packages (e.g., dsum, zone-to, dediff, dcartesian-power, is-equal-int32array) and scanned for bugs in the C implementations (*wx*y, cone-to), the new packages, the namespace updates, the cosqi change, and the ULP test migrations.
• Deliberately excluded anything requiring interpretation (cosmetic blank lines, README comment style) and anything predating the window. In particular, ndarray/dediff README has the same "prior to computing differences" wording, and the set() example in the array/uint64 README has an unused Uint64 require, but both predate this window and are left untouched.
• The same dead Uint64 require also exists in the entries() example in array/uint64/docs/types/index.d.ts. That file is intentionally left untouched here: any change to it trips pre-existing @typescript-eslint/no-unused-vars errors (unused Iterator, LocaleOptions, Predicate, Callback, MapFcn, Reducer, CompareFcn aliases, introduced in 1976459) that are out of scope for this PR.

Checklist

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

• Read, understood, and followed the contributing guidelines.

AI Assistance

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• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
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This PR was written primarily by Claude Code as part of an automated daily review of commits merged to develop.

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🤖 Generated with Claude Code

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
array/uint64	$\\color{red}1316/1321$ $\\color{green}+99.62\\%$	$\\color{red}196/200$ $\\color{green}+98.00\\%$	$\\color{green}21/21$ $\\color{green}+100.00\\%$	$\\color{red}1316/1321$ $\\color{green}+99.62\\%$
blas/ext/base/ndarray/gediff	$\\color{green}160/160$ $\\color{green}+100.00\\%$	$\\color{green}3/3$ $\\color{green}+100.00\\%$	$\\color{green}1/1$ $\\color{green}+100.00\\%$	$\\color{green}160/160$ $\\color{green}+100.00\\%$

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