Editorial improvements for #802

[github-actions]

Editorial Review

This PR contains structural improvements to documentation changed in #802.

Changes

• app/en/references/mcp/python/context/page.mdx: Structure - Added intro line per default page structure; Arcade Terminology - Changed "Secrets" to "secrets" and "Tool" to "tool" in tables
• app/en/references/mcp/python/errors/page.mdx: Structure - Added intro line and expanded first paragraph following 10/20/70 format to explain who the page is for, what it covers, and when you'll use these exceptions
• app/en/references/mcp/python/middleware/page.mdx: Structure - Added intro line and first paragraph following 10/20/70 format; Structure - Changed section headings to use verbs for task-based content
• app/en/references/mcp/python/page.mdx: Structure - Added intro line after title; Arcade Terminology - Changed "Resource Server" to "Resource server" to follow correct casing
• app/en/references/mcp/python/server/page.mdx: Structure - Added intro line explaining what the page covers; Terminology - Changed "MCP Server" to "MCP server" in description

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 21, 2026 11:56pm