Merge bitcoin/bitcoin#30457: doc: getaddressinfo[isscript] is optional

fa6390df20 doc: getaddressinfo[isscript] is optional (MarcoFalke)

Pull request description:

  `isscript` is unknown for unknown witness versions, so it should be marked optional in the docs

  Fixes https://github.com/bitcoin/bitcoin/issues/30456

ACKs for top commit:
  stickies-v:
    ACK fa6390df20
  tdb3:
    ACK fa6390df20

Tree-SHA512: f728f18e0871923225e0bf29594f8095997456cf55409f42087b5f70f95bef10f984323b48d2b484b6705f23b04e9e8a3fe42446830638fdd70453c18fd7f189

src/wallet/rpc/addresses.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2022 The Bitcoin Core developers
+// Copyright (c) 2011-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -534,7 +534,7 @@ RPCHelpMan getaddressinfo()
                         {RPCResult::Type::BOOL, "solvable", "If we know how to spend coins sent to this address, ignoring the possible lack of private keys."},
                         {RPCResult::Type::STR, "desc", /*optional=*/true, "A descriptor for spending coins sent to this address (only when solvable)."},
                         {RPCResult::Type::STR, "parent_desc", /*optional=*/true, "The descriptor used to derive this address if this is a descriptor wallet"},
-                        {RPCResult::Type::BOOL, "isscript", "If the key is a script."},
+                        {RPCResult::Type::BOOL, "isscript", /*optional=*/true, "If the key is a script."},
                         {RPCResult::Type::BOOL, "ischange", "If the address was used for change output."},
                         {RPCResult::Type::BOOL, "iswitness", "If the address is a witness address."},
                         {RPCResult::Type::NUM, "witness_version", /*optional=*/true, "The version number of the witness program."},