Merge #15272: doc: correct logging return type and RPC example
e1c27da303 doc: correct logging rpc return type and example (fanquake)
Pull request description:
Logging status is returned as a bool.
```
src/bitcoin-cli logging "[\"all\"]" "[\"http\"]"
{
"net": true,
"tor": true,
"mempool": true,
"http": false,
"bench": true,
"zmq": true,
"db": true,
"rpc": true,
"estimatefee": true,
"addrman": true,
"selectcoins": true,
"reindex": true,
"cmpctblock": true,
"rand": true,
"prune": true,
"proxy": true,
"mempoolrej": true,
"libevent": true,
"coindb": true,
"qt": true,
"leveldb": true
}
```
Also corrects the RPC example so that `libevent` logging will actually be turned off.
Tree-SHA512: 2de7130df51688d2d6636c12fd56326362794118a10efc8100f0bf541a7da00a12a6cd9d75e599a104513a050bbe49b418ea460ee8033ac6cf6ffb8e8e9140d6
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