Tested in v0.21.0

```
createmultisig 1 '["04ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a4165326"]' p2sh-segwit
{
  "address": "3LfGXVPHtrC9A99JNiAPnygnQuPdpASvN3",
  "redeemScript": "514104ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a416532651ae",
  "descriptor": "sh(multi(1,04ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a4165326))#dyera70q"
}
```
same result for:
```
createmultisig 1 '["04ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a4165326"]' bech32
```

Best if this throws an error telling the user it won't make a nonstandard address.

{
    return RPCHelpMan{"createmultisig",
                "\nCreates a multi-signature address with n signature of m keys required.\n"
                "It returns a json object with the address and redeemScript.\n",
                {
                    {"nrequired", RPCArg::Type::NUM, RPCArg::Optional::NO, "The number of required signatures out of the n keys."},
                    {"keys", RPCArg::Type::ARR, RPCArg::Optional::NO, "The hex-encoded public keys.",
                        {
                            {"key", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "The hex-encoded public key"},
                        }},
                    {"address_type", RPCArg::Type::STR, RPCArg::Default{"legacy"}, "The address type to use. Options are \"legacy\", \"p2sh-segwit\", and \"bech32\"."},
                },
                RPCResult{
                    RPCResult::Type::OBJ, "", "",
                    {
                        {RPCResult::Type::STR, "address", "The value of the new multisig address."},
                        {RPCResult::Type::STR_HEX, "redeemScript", "The string value of the hex-encoded redemption script."},
                        {RPCResult::Type::STR, "descriptor", "The descriptor for this multisig"},
                    }
                },
                RPCExamples{
            "\nCreate a multisig address from 2 public keys\n"
            + HelpExampleCli("createmultisig", "2 \"[\\\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\\\",\\\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\\\"]\"") +
            "\nAs a JSON-RPC call\n"
            + HelpExampleRpc("createmultisig", "2, [\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\",\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\"]")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
    int required = request.params[0].get_int();