Corrected JSON typo on setban of net.cpp

Github-Pull: #8512
Rebased-From: 6ffd996b8e

src/rpc/net.cpp

@@ -484,7 +484,7 @@ UniValue setban(const UniValue& params, bool fHelp)
                             "\nExamples:\n"
                             + HelpExampleCli("setban", "\"192.168.0.6\" \"add\" 86400")
                             + HelpExampleCli("setban", "\"192.168.0.0/24\" \"add\"")
-                            + HelpExampleRpc("setban", "\"192.168.0.6\", \"add\" 86400")
+                            + HelpExampleRpc("setban", "\"192.168.0.6\", \"add\", 86400")
                             );
 
     CSubNet subNet;