fix a typo

Author: pirapira

src/rpcwallet.cpp

@@ -314,7 +314,7 @@ Value sendtoaddress(const Array& params, bool fHelp)
     if (fHelp || params.size() < 2 || params.size() > 4)
         throw runtime_error(
             "sendtoaddress \"bitcoinaddress\" amount ( \"comment\" \"comment-to\" )\n"
-            "\nSent an amount to a given address. The amount is a real and is rounded to the nearest 0.00000001\n"
+            "\nSend an amount to a given address. The amount is a real and is rounded to the nearest 0.00000001\n"
             + HelpRequiringPassphrase() +
             "\nArguments:\n"
             "1. \"bitcoinaddress\"  (string, required) The bitcoin address to send to.\n"