util: HelpExampleRpc formatting fixup

to conform to json-rpc spec as per
https://www.jsonrpc.org/specification#examples

Author: jonatack

src/rpc/util.cpp

@@ -116,8 +116,8 @@ std::string HelpExampleCli(const std::string& methodname, const std::string& arg
 
 std::string HelpExampleRpc(const std::string& methodname, const std::string& args)
 {
-    return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", "
-        "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
+    return "> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\": \"curltest\", "
+        "\"method\": \"" + methodname + "\", \"params\": [" + args + "]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
 }
 
 // Converts a hex string to a public key if possible