RPC Docs: addmultisigaddress is intended for non-watchonly addresses

src/wallet/rpcwallet.cpp

@@ -1015,6 +1015,8 @@ UniValue addmultisigaddress(const JSONRPCRequest& request)
         std::string msg = "addmultisigaddress nrequired [\"key\",...] ( \"account\" )\n"
             "\nAdd a nrequired-to-sign multisignature address to the wallet.\n"
             "Each key is a Bitcoin address or hex-encoded public key.\n"
+            "This functionality is only intended for use with non-watchonly addresses.\n"
+            "See `importaddress` for watchonly p2sh address support.\n"
             "If 'account' is specified (DEPRECATED), assign address to that account.\n"
 
             "\nArguments:\n"