bpo-43742: Mention server example in asyncio stream docs

[jaswdr]

Minor addition to asyncio-stream documentation to mention that the server example is in the Examples sections.

This comes from issue43821 where the person was not sure if the example would handle the client and server part simultaneously in the example.

https://bugs.python.org/issue43742

[the-knights-who-say-ni]

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[orsenthil]

We follow the pattern of See also in most of the docs.
And this doesn't need a news entry.

So, -1 on this patch.

Welcome your contribution, and please look for another improvement to contribute. Thank you.