RPC: Fix more formatting nits
listsinceblock had a double ellipsis (elision + continuation); this looks ugly, just one is needed.
Elision ellipsis wasn't getting a comma, so was truncated to ".." by comma-removal code.
Elision ellipsis was indented incorrectly (as if it was a subitem).
Similarly, type "none" would get truncated to "Non", when it should really be "null" anyway.
This is a backport of Core PR18508
Related to D8892
ninja all check-all
Check the help message for a list of commands from https://github.com/bitcoin/bitcoin/pull/18508#issuecomment-608610053
src/bitcoin-cli help mockscheduler # None -> null src/bitcoin-cli help getblock # ... -> ..., src/bitcoin-cli help decodepsbt # .. -> ...
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D8900