Javascript: Batch transactions tutorial

[maria-robobug]

Fixes #3366

• Adds two tutorials for Batch transactions:
  • Send a Single Account Batch Transaction
  • Send a Multi-Account Batch Transaction
• Adds mention of minimum required batch transactions (2) in docs + missing temARRAY_EMPTY error

Currently only Javascript-aware, but will add Python examples in a separate PR.

Preview here: https://xrpl-dev-portal--batch-transactions-tutorial.preview.redocly.app/docs/tutorials/how-tos/use-batch-transactions

[maria-robobug]

FYI, updated to use this approach to check inner transactions:

i believe you’d need to get the hashes of the inner transactions and see if they exist on the ledger.

[oeggert]

Mostly good, just a few suggestions to code. Also are we writing Batch transactions as Batch transactions? I think we should be wrapping it when we're referring to the specific transaction by name, but I don't think we've been very consistent in our docs.

[maria-robobug]

Also are we writing Batch transactions as Batch transactions? I think we should be wrapping it when we're referring to the specific transaction by name, but I don't think we've been very consistent in our docs.

@oeggert yes, good point we should be wrapping Batch when we refer to the transaction. I'll update.

[oeggert]

LGTM