Editorial improvements for #626

[github-actions]

Editorial Review

This PR contains structural improvements to documentation changed in #626.

Changes

• app/en/get-started/quickstarts/mcp-server-quickstart/page.mdx: Structure - Added intro line after main heading; Headings - Changed to sentence case for "Create your server", "Set up the secrets in your environment", "Run your MCP server", "Configure your MCP clients", and "Next steps"
• app/en/guides/create-tools/tool-basics/build-mcp-server/page.mdx: Structure - Added intro line; Headings - Changed to sentence case
• app/en/guides/create-tools/tool-basics/create-tool-secrets/page.mdx: Voice and Tone - Removed hedging language like "very inconvenient"; Terminology - Changed "MCP Server" to "MCP server"; Removed "simply" to avoid dumbing down language
• app/en/guides/deployment-hosting/arcade-deploy/page.mdx: Structure - Added intro line; Arcade Terminology - Corrected capitalization of "MCP Server" to "MCP server" in body text and headings

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 7:52am