The RPC docs are now enforced to specify the json type of the args and results at compile time. However, some help texts contain the type twice. (E.g. https://github.com/bitcoin/bitcoin/pull/17809#discussion_r386295217 ). The duplicate type in the description should be removed.

Duplicates can be found with this command:

```sh
git grep --extended-regexp  'RPC.*(ARR|OBJ).*json (array|object)' src/rpc/ src/wallet/rpc*
```

#### Useful skills:

Basic understanding of how to compile and run Bitcoin Core.

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{"query_options", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED_NAMED_ARG, "JSON with query options",
                        {
                            {"minimumAmount", RPCArg::Type::AMOUNT,  "0", "Minimum value of each UTXO in " + CURRENCY_UNIT + ""},
                            {"maximumAmount", RPCArg::Type::AMOUNT,  "unlimited", "Maximum value of each UTXO in " + CURRENCY_UNIT + ""},
                            {"maximumCount", RPCArg::Type::NUM,  "unlimited", "Maximum number of UTXOs"},
                            {"minimumSumAmount", RPCArg::Type::AMOUNT,  "unlimited", "Minimum sum value of all UTXOs in " + CURRENCY_UNIT + ""},
                        },
                        "query_options"},
                },
                RPCResult{
                    RPCResult::Type::ARR, "", "",
                    {
                        {RPCResult::Type::OBJ, "", "",
                        {
                            {RPCResult::Type::STR_HEX, "txid", "the transaction id"},
                            {RPCResult::Type::NUM, "vout", "the vout value"},
                            {RPCResult::Type::STR, "address", "the bitcoin address"},
                            {RPCResult::Type::STR, "label", "The associated label, or \"\" for the default label"},
                            {RPCResult::Type::STR, "scriptPubKey", "the script key"},
                            {RPCResult::Type::STR_AMOUNT, "amount", "the transaction output amount in " + CURRENCY_UNIT},
                            {RPCResult::Type::NUM, "confirmations", "The number of confirmations"},
                            {RPCResult::Type::STR_HEX, "redeemScript", "The redeemScript if scriptPubKey is P2SH"},
                            {RPCResult::Type::STR, "witnessScript", "witnessScript if the scriptPubKey is P2WSH or P2SH-P2WSH"},
                            {RPCResult::Type::BOOL, "spendable", "Whether we have the private keys to spend this output"},
                            {RPCResult::Type::BOOL, "solvable", "Whether we know how to spend this output, ignoring the lack of keys"},
                            {RPCResult::Type::BOOL, "reused", "(only present if avoid_reuse is set) Whether this output is reused/dirty (sent to an address that was previously spent from)"},
                            {RPCResult::Type::STR, "desc", "(only when solvable) A descriptor for spending this output"},
                            {RPCResult::Type::BOOL, "safe", "Whether this output is considered safe to spend. Unconfirmed transactions"
            "                              from outside keys and unconfirmed replacement transactions are considered unsafe\n"
                                "and are not eligible for spending by fundrawtransaction and sendtoaddress."},