Add module examples for TCP proxy and SSL proxy LBs

[betsy-lichtenberg]

Here are some docs that describe these LB types:

https://cloud.google.com/load-balancing/docs/ssl https://cloud.google.com/load-balancing/docs/tcp

https://cloud.google.com/load-balancing/docs/ssl/setting-up-ssl https://cloud.google.com/load-balancing/docs/tcp/setting-up-tcp

[github-actions[bot]]

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