add \n

currently shows as:
...
getlasthave <username> | <groupname> [user1,user2...]
getlastsoftcheckpointReturns votes of last soft checkpoint.
getmentions <localuser> <count> '{"max_id":max_id,"since_id":since_id}'
...

src/rpcblockchain.cpp

@@ -214,7 +214,7 @@ Value getlastsoftcheckpoint(const Array& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)
         throw runtime_error(
-            "getlastsoftcheckpoint"
+            "getlastsoftcheckpoint\n"
             "Returns votes of last soft checkpoint.");
 
     Object result;