explain why an `asset_id` is not generated by `tapcli assets mint`

[ZZiigguurraatt]

On this line

docs.lightning.engineering/lightning-network-tools/taproot-assets/first-steps.md

Line 47 in dede15c

This will add your asset to a minting queue called a batch, which allows multiple assets to be created in a single minting transaction. This saves fees and conserves blockspace. To execute the batch and publish your mint transaction to the blockchain run:

I think it also needs to be elaborated that an asset does not have an asset_id while in the minting queue because it has not been placed in a transaction yet and the asset_id is derived from the genesis output which is the transaction that the asset is minted in.

[Liongrass]

I've added a hint box to the guide, thank you for the suggestion