Adapt the inter-canister call recommendations to anonymous refunds feature

[oggy-dfin]

Adjusts the Rust tutorial and the inter-canister calls reference doc to reflect the state after anonymous cycle refunds for bounded-wait calls are merged on the mainnet. DO NOT MERGE until that happens.

The corresponding examples repo PR should be merged first, also one should check that the permalinks for the code snippets still work (I don't know what happens when the pull request branch is deleted)

[github-actions[bot]]

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