[ECK 3.3] - Elastic Package Registry release documentation

[naemono]

Summary

This change adds documentation for the upcoming ECK 3.3 release for Package Registry.

Open Question

• There's ECK + GDCH documentation. Should we be updating that now as well?

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Tool(s) and model(s) used:
Cursor/Auto

[github-actions]

Vale Linting Results

Summary: 1 suggestion found

💡 Suggestions (1)

File	Line	Rule	Message
deploy-manage/deploy/cloud-on-k8s/package-registry.md	74	Elastic.WordChoice	Consider using 'refer to (if it's a document), view (if it's a UI element)' instead of 'See', unless the term is in the UI.

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[Copilot]

Pull request overview

This PR adds documentation for ECK 3.3's new Package Registry feature, which enables deployment and management of Elastic Package Registry as a Kubernetes resource using ECK.

Changes:

• Added comprehensive Package Registry documentation file with deployment, configuration, and troubleshooting sections
• Updated table of contents to include the new Package Registry documentation page
• Added references to Package Registry in the orchestration overview page
• Included Package Registry Helm chart deployment examples

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
deploy-manage/toc.yml	Added package-registry.md to the table of contents under logstash section
deploy-manage/deploy/cloud-on-k8s/package-registry.md	New comprehensive documentation for Package Registry deployment, configuration, and Kibana integration
deploy-manage/deploy/cloud-on-k8s/orchestrate-other-elastic-applications.md	Added Package Registry to the list of orchestrated applications
deploy-manage/deploy/cloud-on-k8s/managing-deployments-using-helm-chart.md	Added Helm chart deployment examples for Package Registry with Elasticsearch, Kibana, and Fleet Server

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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[Copilot]

The phrasing "allows installing" is grammatically awkward. It should be "allows you to install" or "describes how to install" for better clarity and consistency with the rest of the documentation. Additionally, there appears to be extra whitespace (two spaces instead of one) before the code block that should be removed.