Add HttpRetryOptions example and defaults to documentation

[ffeldhaus]

After retry was recently implemented and merged in #982 the documentation needs to be updated to provide an example how to use retry. Also the retry defaults of HttpRetryOptions need to be documented, the pydantic model for HttpRetryOptions unfortunately currently specifies the defaults as None with no further explanations.

Retry is the most important part for any production grade service and is mandatory to handle e.g. 429 errors during high load.

[janasangeetha]

Hey @ffeldhaus
Thank you for reaching out!
We appreciate you taking the time to share your thoughts with us, and we'll be filing a feature request. We’ll keep you updated once we have more information.
Thank you!