This mini-PR updates the result help of the getchaintxstats RPC by showing the following fields as "optional":
- window_tx_count
- window_interval
- txrate
Help output diff between master and PR branch:
16,18c16,18
< "window_tx_count" : n, (numeric) The number of transactions in the window. Only returned if "window_block_count" is > 0
< "window_interval" : n, (numeric) The elapsed time in the window in seconds. Only returned if "window_block_count" is > 0
< "txrate" : n (numeric) The average rate of transactions per second in the window. Only returned if "window_interval" is > 0
---
> "window_tx_count" : n, (numeric, optional) The number of transactions in the window. Only returned if "window_block_count" is > 0
> "window_interval" : n, (numeric, optional) The elapsed time in the window in seconds. Only returned if "window_block_count" is > 0
> "txrate" : n (numeric, optional) The average rate of transactions per second in the window. Only returned if "window_interval" is > 0
