Merge #15754: rpc: getrpcinfo docs

f4b7a2f rpc: getrpcinfo docs (Ben Carman)

Pull request description:

  Fixes #15731

ACKs for commit f4b7a2:
  laanwj:
    utACK f4b7a2f

Tree-SHA512: 45dce83c4bfac2ddf85133a29aee332e9de8f73c15438ce899a2edbcd0d82d4f743753f6699c50cbc62d110fa8c6bc257722447e1090cdd23acbe00f26014ec8

Author: MarcoFalke

src/rpc/server.cpp

@@ -297,8 +297,20 @@ static UniValue getrpcinfo(const JSONRPCRequest& request)
             RPCHelpMan{"getrpcinfo",
                 "\nReturns details of the RPC server.\n",
                 {},
-                RPCResults{},
-                RPCExamples{""},
+                RPCResult{
+            "{\n"
+            " \"active_commands\" (array) All active commands\n"
+            "  [\n"
+            "   {               (object) Information about an active command\n"
+            "    \"method\"       (string)  The name of the RPC command \n"
+            "    \"duration\"     (numeric)  The running time in microseconds\n"
+            "   },...\n"
+            "  ]\n"
+            "}\n"
+                },
+                RPCExamples{
+                    HelpExampleCli("getrpcinfo", "")
+                + HelpExampleRpc("getrpcinfo", "")},
             }.ToString()
         );
     }