wallet: Improve wallet creation error message with usage hint #33124

Improve wallet creation error message with usage hint，The original error message did not provide a method for specifying the wallet name, causing confusion for users.

before:

$ ./build/bin/bitcoin-wallet create                                                 
Wallet name must be provided when creating a new wallet.

after:

$ ./build/bin/bitcoin-wallet create                                                 
Wallet name must be provided when creating a new wallet. Use -wallet=<wallet-name> to specify the name.

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33124.

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Conflicts

No conflicts as of last run.

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I'm not sure this is necessary since the correct syntax can be found using -help

Yeah, tend to agree. One will have to read the full help anyway to understand it.