NGINXaaS for GCP: update release note for 37.0

[xynicole]

Proposed changes

Announce NGINX Plus 37 availability and update directives list

Checklist

Before sharing this pull request, I completed the following checklist:

• I read the Contributing guidelines
• My branch adheres to the Git conventions
• My content changes adhere to the F5 Technical Writing Style Guide
• If my changes involve potentially sensitive information¹, I have assessed the possible impact
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Footnotes

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[github-actions]

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[Copilot]

Pull request overview

This PR updates the F5 NGINXaaS for Google Cloud documentation to announce the NGINX Plus 37.0 upgrade and align the documented directive support lists with new/changed directives introduced in that release.

Changes:

• Add a July 2026 changelog entry announcing the upgrade to NGINX Plus 37.0 and noting related behavioral changes.
• Mark ssl_ech_file as disallowed and add error_log_tag / max_headers to the supported directives list.
• Reformat several existing region tables/lists in the changelog for cleaner Markdown rendering.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
content/nginxaas/google/deploy/nginx-configuration/overview.md	Updates directive support documentation for NGINX Plus 37.0 (adds ssl_ech_file disallow + new directive links).
content/nginxaas/google/changelog.md	Adds the NGINX Plus 37.0 release announcement and normalizes formatting in older entries.

[ornj]

Mentioned on Slack that we might want to provide specific guidance around issues that may arise with the http/1.1 for upstreams and keepalive changes. Otherwise, lgtm 💨