Add Ruby to AI Guard integrations

[y9v]

What does this PR do? What is the motivation?

This PR adds RubyLLM to Ruby integrations for AI Guard product. I also fixes broken links for Python and Node.js integrations.

Merge instructions

Merge readiness:

• Ready for merge

For Datadog employees:

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AI assistance

Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/y9v/add-ruby-to-ai-guard-integrations/security/ai_guard/setup/automatic_integrations

[evazorro]

Could you take a look at our contributing guide and make sure you're following the conventions there? A few specific issues I'm noticing:

• Reference links should remain numbered (e.g. you've changed [LangChain Python SDK][1] to [LangChain Python SDK][langchain-python-sdk]; please change it back)
• We don't use this anchor formatting in headers: {#langchain}

I'll also run an automated review on your PR now that may produce some suggestions for you to apply.

[evazorro]

/review

[github-actions]

🤖 Automated review by Claude. AI-generated; verify before acting.

Nice, focused addition of RubyLLM auto-instrumentation. A couple of small consistency nits inline; nothing blocking.

_{Reviewed 670ac00616423b0ea18a9bd43554fb674a5ad774 — workflow run}

[y9v]

@evazorro Thank you for your review! I fixed things that you mentioned (and the suggestions from codex)

[evazorro]

@y9v looks good! Thanks for making those changes!