Fix grammar

Author: TheodoreSpeaks

apps/docs/content/docs/en/mcp/index.mdx

@@ -18,7 +18,7 @@ MCP is an open standard that enables AI assistants to securely connect to extern
 - Execute custom tools and scripts
 - Maintain secure, controlled access to external resources
 
-## Adding a MCP Server as a Tool
+## Adding an MCP Server as a Tool
 
 MCP servers provide collections of tools that your agents can use.