This commit includes several enhancements to the MCP integration guide:
- Adds a section on connecting to multiple MCP servers with a runnable example.
- Ensures consistent mention and examples for Streamable HTTP transport.
- Adds a manual lifecycle example for Streamable HTTP.
- Clarifies Stdio command examples.
- Refines definitions of Stdio, SSE, and Streamable HTTP transports.
- Simplifies comments in code examples for clarity.