Editorial improvements for #746

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Editorial Review

This PR contains structural improvements to documentation changed in #746.

Changes

• app/en/get-started/agent-frameworks/google-adk/overview/page.mdx: Structure - Added intro line as required by default page structure (10/20/70 format)
• app/en/get-started/agent-frameworks/google-adk/setup-python/page.mdx: Structure - Added intro line per default page structure requirement; Voice and tone - Changed "Apply your internal or database user ID" to "Use your internal or database user ID" to be more direct and confident
• app/en/get-started/agent-frameworks/google-adk/setup-typescript/page.mdx: Structure - Added intro line explaining what the reader will learn from the page
• app/en/get-started/agent-frameworks/langchain/overview/page.mdx: Structure - Added intro line explaining what the page covers

Context

These suggestions are based on our style guide and focus on document structure, not word-level fixes (which are handled by Vale).

Review each change carefully - accept what improves the docs, modify what needs adjustment, or close this PR if the changes aren't helpful.

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Feb 12, 2026 5:17pm