Reformat validateaddress help, add missing iswatchonly description.

src/rpcmisc.cpp

@@ -161,6 +161,7 @@ UniValue validateaddress(const UniValue& params, bool fHelp)
             "  \"address\" : \"bitcoinaddress\", (string) The bitcoin address validated\n"
             "  \"scriptPubKey\" : \"hex\",       (string) The hex encoded scriptPubKey generated by the address\n"
             "  \"ismine\" : true|false,        (boolean) If the address is yours or not\n"
+            "  \"iswatchonly\" : true|false,   (boolean) If the address is watchonly\n"
             "  \"isscript\" : true|false,      (boolean) If the key is a script\n"
             "  \"pubkey\" : \"publickeyhex\",    (string) The hex value of the raw public key\n"
             "  \"iscompressed\" : true|false,  (boolean) If the address is compressed\n"