Merge #14653: rpcwallet: Add missing transaction categories to rpc helptexts
f3f6dde56e Test coinbase category in wallet rpcs (andrewtoth)
e982f0b682 Add all category options to wallet rpc help (andrewtoth)
Pull request description:
The current helptext for `listtransactions`, `listsinceblock` and `gettransaction` only list two of the five possible options for `category`. This incorrectly implies that these are the only two options, and can cause problems if the other three options aren't accounted for. Also, some of the documentation is incorrect when specifying which options are returned for which categories.
This PR updates the helptext for these RPCs and adds a functional regression test for the cases when the other three categories are returned.