Don't require MCPServerStreamableHTTP and MCPServerSSE url to be a keyword argument

[franciscovilchezv]

This PR updates the documentation example for initializing MCPServerStreamableHTTP.

Previously, the example used a positional argument:

server = MCPServerStreamableHTTP('http://localhost:8000/mcp')  # (1)!

Updated to explicitly use the url keyword argument:

server = MCPServerStreamableHTTP(url='http://localhost:8000/mcp')  # (1)!

This change improves clarity, aligns with the current API, and avoids confusion for users referencing the docs.

[DouweM]

@franciscovilchezv Good catch! I think we were a little to aggressive in requiring all args to be kwargs. Can you instead update the class to move the * after url and leave the docs example as it was?

In MCPServerStdio, I think we can also move the * to be after command and args.

Edit: Did it myself :)

[DouweM]

@franciscovilchezv Thanks Francisco!

[franciscovilchezv]

Thanks @DouweM ! You are the best