doc: improve wording and clarity in developer-notes #35045

Improve wording and clarity in developer-notes documentation.

This change improves grammar and readability without altering the meaning of the existing guidelines.

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The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

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Reviews

See the guideline for information on the review process. A summary of reviews will appear here.

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LLM Linter (✨ experimental)

Possible typos and grammar issues:

• In C++ parlor this means ... -> In C++ parlance this means ... [Misspelling: “parlor” should be “parlance”.]
• ... main chain activation, spawn indexes background sync threads and mempool load. -> ... main chain activation, spawning indexes background sync threads and mempool load. [Grammar: the list uses noun/gerund forms; “spawn” should match as a gerund (“spawning”) for consistency/readability.]

^{2026-04-10 08:37:32}