docs: add retry info for idempotency

[bahrmichael]

Summary

This PR adds documentation on how the operation parameter of the retryIf handler can be used to avoid non-idempotent requests.

Set of changes

• doc updates for retry-exchange

[changeset-bot[bot]]

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Latest commit: cf26ad3c65c5c57576e5ae43e82ce4b50132de19

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[kitten]

Note here: the docs haven't been in a super deployable and maintainable state here, so currently their deployments aren't necessarily working and we'd have to fix this first to be able to merge this afaik. We haven't really checked on them and they are in state where it's either easier to replace them or to double-check that they still deploy and work as expected.