Broken link - Assistant Development Guide

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Assistant Development Guide [1] contains a link to "Semantic Kernel assistant example" [2] that does not exist.

[1] https://github.com/microsoft/semanticworkbench/blob/main/docs/ASSISTANT_DEVELOPMENT_GUIDE.md
[2] https://github.com/microsoft/semanticworkbench/blob/main/examples/semantic-kernel-python/README.md