docs: fix spelling issues and update word list

[tiran]

Pull Request Description

What

Fix typos and add missing terms to the spelling word list.

• PR follows CONTRIBUTING.md guidelines

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 7368045a-e563-4414-95b9-30ae2a27bfe6

📥 Commits

Reviewing files that changed from the base of the PR and between 0413cfe and 9cfbe57.

📒 Files selected for processing (2)

• docs/proposals/release-cooldown.md
• docs/spelling_wordlist.txt

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📝 Walkthrough

Walkthrough

This PR contains documentation updates and spell-check configuration expansions. The release-cooldown proposal documentation is revised for clarity, changing terminology from "reviewable" to "auditable" and standardizing spelling conventions ("behaviour" to "behavior", "transitive deps" to "transitive dependencies"). Additionally, the spelling wordlist is expanded to include 14 new allowed terms for spell-checking purposes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main changes: fixing spelling issues and updating the word list across documentation files.
Description check	✅ Passed	The description is directly related to the changeset, identifying the core objective of fixing typos and adding missing terms to the spelling word list.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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