docs: improve SEO title for MCP servers page (#239)

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

tools/mcp.mdx

@@ -1,5 +1,5 @@
 ---
-title: MCP Servers
+title: MCP servers for the X API and X developer docs
 sidebarTitle: MCP
 description: Connect Grok, Cursor, and other AI tools to the X API and X developer docs through hosted Model Context Protocol servers using xurl and docs search.
 keywords: ["XMCP", "MCP", "Model Context Protocol", "docs MCP", "AI agent", "AI tools", "Grok", "Cursor", "xurl", "OpenAPI", "MCP server"]