content: Update Node.js release cycle information

[matthewmayer]

Clarified the release status of odd and even Node.js versions and updated information on the release cycle starting with Node.js 27. While the change has not happened yet, would be good to list this on the releases page so developers who missed the announcement are aware of it in good time.

Description

Clarifies that the odd/even distinction will not happen in future.

Validation

Documentation update only

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	May 7, 2026 4:35pm

[cursor]

PR Summary

Low Risk
Low risk documentation-only change; risk is limited to potential confusion if the stated future release policy changes.

Overview
Updates previous-releases.mdx to clarify that the odd/even release-line behavior applied historically through Node.js 26, and adds new guidance that starting with Node.js 27 the project will follow an annual cadence with each major moving from Current to Active LTS after six months.

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