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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cats = cats.get_array();
    for (unsigned int i = 0; i < cats.size(); ++i) {
        std::string cat = cats[i].get_str();
        bool success;
        if (enable) {
            success = LogInstance().EnableCategory(cat);
        } else {
            success = LogInstance().DisableCategory(cat);
        }
        if (!success) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "unknown logging category " + cat);
        }
    }
}
UniValue logging(const JSONRPCRequest& request)
{
            RPCHelpMan{"logging",
            "Gets and sets the logging configuration.\n"
            "When called without an argument, returns the list of categories with status that are currently being debug logged or not.\n"
            "When called with arguments, adds or removes categories from debug logging and return the lists above.\n"
            "The arguments are evaluated in order \"include\", \"exclude\".\n"
            "If an item is both included and excluded, it will thus end up being excluded.\n"
            "The valid logging categories are: " + ListLogCategories() + "\n"
            "In addition, the following are available as category names with special meanings:\n"
            "  - \"all\",  \"1\" : represent all logging categories.\n"
            "  - \"none\", \"0\" : even if other logging categories are specified, ignore all of them.\n"
            ,