RHAIENG-1859: LLS 3.0 not supported on IBM power/z

[kelbrown20]

Description: Add a note in the RHOAI 3.0 documentation that the Llama Stack Operator is not supported on IBM Power/Z

Preview: Overview of Llama Stack

Summary by CodeRabbit

• Documentation
  • Added clarification regarding platform compatibility, noting that Llama Stack Operator has limitations on specific hardware architectures.

[coderabbitai]

Walkthrough

Adds a NOTE block to documentation stating that Llama Stack Operator is not currently supported on IBM Power/Z machines. The note is positioned between deployment information and additional resources sections in the overview document.

Changes

Cohort / File(s)	Summary
Documentation Update modules/overview-of-llama-stack.adoc	Added a NOTE block documenting unsupported IBM Power/Z machine platforms for Llama Stack Operator

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: adding a note about Llama Stack 3.0 lacking support on IBM Power/Z systems.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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