Editorial improvements for #819

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Editorial Review

This PR contains structural improvements to documentation changed in #819.

Changes

• app/en/get-started/quickstarts/mcp-server-quickstart/page.mdx: Structure - Added required intro line; Changed title to sentence case per heading guidelines; Changed heading case throughout (Create Your Server → Create your server, etc.); Changed Next Steps → Next steps per section case requirements
• app/en/guides/create-tools/tool-basics/build-mcp-server/page.mdx: Structure - Added intro line; changed heading capitalization for "Create your server", "Set up the secrets", "Run your MCP server", "Configure your MCP clients"; moved "Next steps" to H2 level
• app/en/guides/create-tools/tool-basics/create-tool-secrets/page.mdx: Structure - Added intro line and reorganized first paragraph; Voice and tone - Removed "simply" to avoid dumbing down language

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 26, 2026 8:56pm