Merge #15272: doc: correct logging return type and RPC example

e1c27da30378940095806b2bf9989b162ed8ac07 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

src/rpc/misc.cpp

@@ -1080,12 +1080,12 @@ static UniValue logging(const JSONRPCRequest& request)
             "     ]\n"
             "\nResult:\n"
             "{                   (json object where keys are the logging categories, and values indicates its status\n"
-            "  \"category\": 0|1,  (numeric) if being debug logged or not. 0:inactive, 1:active\n"
+            "  \"category\": true|false,  (bool) if being debug logged or not. false:inactive, true:active\n"
             "  ...\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("logging", "\"[\\\"all\\\"]\" \"[\\\"http\\\"]\"")
-            + HelpExampleRpc("logging", "[\"all\"], \"[libevent]\"")
+            + HelpExampleRpc("logging", "[\"all\"], [\"libevent\"]")
         );
     }