Fix RPC help for dumptxoutset
Summary: A mandatory argument cannot have a default value. The help message was not formatted correctly, as a result.
Test Plan:
Before:
$ src/bitcoin-cli help dumptxoutset dumptxoutset path to the output file. If relative, will be prefixed by datadir. Write the serialized UTXO set to disk. Arguments: 1. path (string, required) Result: ...
After:
$ src/bitcoin-cli help dumptxoutset dumptxoutset "path" Write the serialized UTXO set to disk. Arguments: 1. path (string, required) path to the output file. If relative, will be prefixed by datadir. Result: ...
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D10155