Docs: Publish a Plugin edits

[urbiz-grafana]

Part of #2366.

Previews:

• https://grafana-dev.com/developers/plugin-tools/publish-a-plugin/
• https://grafana-dev.com/developers/plugin-tools/publish-a-plugin/build-automation
• https://grafana-dev.com/developers/plugin-tools/publish-a-plugin/sign-a-plugin

[github-actions]

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✨ This PR can be merged. It will not be considered when calculating future versions of the npm packages and will not appear in the changelogs.

[Copilot]

Pull request overview

This PR implements documentation improvements for the plugin publishing workflow. The changes enhance clarity, consistency, and adherence to Grafana's documentation guidelines across multiple plugin-related documentation files.

Key changes:

• Improved sentence structure and clarity throughout documentation files
• Standardized code block language specifiers (sh instead of bash)
• Enhanced formatting consistency with bolding, emphasis, and list structures
• Reorganized content for better flow and readability

Reviewed changes

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

File	Description
docusaurus/docs/shared/publish-review-note.md	Restructured caution message for improved clarity and readability
docusaurus/docs/publish-a-plugin/sign-a-plugin.md	Enhanced clarity of instructions, improved code block formatting, and reorganized content with better section headings
docusaurus/docs/publish-a-plugin/package-a-plugin.md	Added "Next steps" section header and improved list formatting
docusaurus/docs/publish-a-plugin/build-automation.md	Updated title, improved instructions clarity, standardized code block formatting, and enhanced list structures

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