doc: correct logging rpc return type and example

Author: fanquake

src/rpc/misc.cpp

@@ -404,13 +404,13 @@ UniValue logging(const JSONRPCRequest& request)
                 },
                 RPCResult{
             "{                   (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"
                 },
                 RPCExamples{
                     HelpExampleCli("logging", "\"[\\\"all\\\"]\" \"[\\\"http\\\"]\"")
-            + HelpExampleRpc("logging", "[\"all\"], \"[libevent]\"")
+            + HelpExampleRpc("logging", "[\"all\"], [\"libevent\"]")
                 },
             }.ToString());
     }