Docs: Minor copy edits for the Block Development Environment page

[ndiego]

This PR makes some minor copy changes to Block Development Environment page to improve readability. One line is also turned into a callout.

[desrosj]

👋 Sorry for any noise. I'm using this draft PR as a way to test a few changes to Props Bot.

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core SVN

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Props: ndiego, desrosj, fabiankaegy.

GitHub Merge commits

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Co-authored-by: ndiego <ndiego@git.wordpress.org>
Co-authored-by: desrosj <desrosj@git.wordpress.org>
Co-authored-by: fabiankaegy <fabiankaegy@git.wordpress.org>

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[github-actions]

Flaky tests detected in dcdd145.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7757124099
📝 Reported issues:

• [Flaky Test] Should keep the font size during a transform from multiple blocks into multiple blocks #47689 in /test/e2e/specs/editor/various/keep-styles-on-block-transforms.spec.js

[fabiankaegy]

Looks good 👍

[ndiego]

@desrosj should I wait to merge this (once approved) until you are done testing? If so, just ping me when the coast is clear.

[desrosj]

Just seeing this, but merging was totally fine! I was able to get everything sorted out (see #58617).