Editorial improvements for #826

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Editorial Review

This PR contains structural improvements to documentation changed in #826.

Changes

• app/en/get-started/quickstarts/mcp-server-quickstart/page.mdx: Structure - Added intro line; changed "Your Server" to "your server", "Your MCP Server" to "your MCP server", "Setup" to "Set up", "Your MCP Clients" to "your MCP clients", "Next Steps" to "Next steps" (sentence case headings)
• app/en/guides/create-tools/tool-basics/build-mcp-server/page.mdx: Structure - Added intro line; Structure - Changed headings to sentence case ("Create Your Server" to "Create your server", etc.); Structure - Changed "Setup" to "Set up" and "Client(s)" to "clients" in headings
• app/en/guides/create-tools/tool-basics/create-tool-secrets/page.mdx: Structure - Added intro line; Terminology - Changed "We" to "Arcade" references; Callouts - Changed "info" callouts to "Note" and "warning" to "Warning"

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 9:04pm