[doc] getblocktemplate: use SegWit in example

src/rpc/mining.cpp

@@ -362,8 +362,8 @@ static UniValue getblocktemplate(const JSONRPCRequest& request)
             "}\n"
 
             "\nExamples:\n"
-            + HelpExampleCli("getblocktemplate", "")
-            + HelpExampleRpc("getblocktemplate", "")
+            + HelpExampleCli("getblocktemplate", "{\"rules\": [\"segwit\"]}")
+            + HelpExampleRpc("getblocktemplate", "{\"rules\": [\"segwit\"]}")
          );
 
     LOCK(cs_main);