Da 1250/fix tutorials titles

[VirajAgarwal1]

Small pr to fix the failing tests regarding the new titles.

[gemini-code-assist]

Caution

Notebooks or Frontmatter Files Have Been Modified

• Please ensure that a frontmatter.md file is accompanying the notebook file, and that the frontmatter is up to date.
• These changes will be published to the developer portal tutorials only if frontmatter.md is included.
• Proofread all changes before merging, as changes to notebook and frontmatter content will update the developer tutorial.

2 Notebook Files Modified:

Notebook File	Frontmatter Included?
capella-model-services/langchain/query_based/RAG_with_Capella_Model_Services_and_LangChain.ipynb	✅
smolagents/query_based/RAG_with_Couchbase_SmolAgents.ipynb	✅

0 Frontmatter Files Modified:

Frontmatter File
Note: frontmatter will be checked and tested in the Test Frontmatter workflow.

[gemini-code-assist]

Code Review

This pull request addresses failing tests by adjusting markdown heading levels in two Jupyter notebooks and includes a minor whitespace cleanup. The changes are small and directly align with the stated goal of fixing tutorial titles.