No mention of how to structure a PendingAirdropId

### Problem

Not clear here https://docs.hedera.com/hedera/sdks-and-apis/sdks/token-service/claim-a-token what the pendingAirdropId is in order to claim / reject an airdrop. It looks a composite of the sender, receiver, and token but I had to go to https://github.com/hashgraph/hedera-sdk-js/blob/main/examples/token-airdrop-example.js to figure out what to do.

### Solution

Introduce the example from https://github.com/hashgraph/hedera-sdk-js/blob/main/examples/token-airdrop-example.js as a tutorial in the docs and reference what the pendingAirdropId is in the specific SDK sectionf

A tutorial on how to reconstruct the PendingAirdropId without the CreateAirdrop record would also be useful

### Alternatives

_No response_