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:

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{
    if (IsValidDestination(dest)) {
        entry.pushKV("address", EncodeDestination(dest));
    }
}
/**
 * List transactions based on the given criteria.
 *
 * @param  pwallet        The wallet.
 * @param  wtx            The wallet transaction.
 * @param  nMinDepth      The minimum confirmation depth.
 * @param  fLong          Whether to include the JSON version of the transaction.
 * @param  ret            The UniValue into which the result is stored.
 * @param  filter_ismine  The "is mine" filter flags.
 * @param  filter_label   Optional label string to filter incoming transactions.
 */
static void ListTransactions(interfaces::Chain::Lock& locked_chain, const CWallet* const pwallet, const CWalletTx& wtx, int nMinDepth, bool fLong, UniValue& ret, const isminefilter& filter_ismine, const std::string* filter_label) EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)
{
    CAmount nFee;
    std::list<COutputEntry> listReceived;
    std::list<COutputEntry> listSent;
    wtx.GetAmounts(listReceived, listSent, nFee, filter_ismine);
    bool involvesWatchonly = wtx.IsFromMe(ISMINE_WATCH_ONLY);
    
    if (!filter_label)
    {
        for (const COutputEntry& s : listSent)