Ava Chow b2f88b53e0 Merge bitcoin/bitcoin#33286: doc: update multisig tutorial to use multipath descriptors
de7c3587cd doc: Update add checksum instructions in tutorial (Ben Westgate)
2a46e94a16 doc: Update multisig-tutorial.md to use multipath descriptors (Ben Westgate)

Pull request description:

  ### Summary

  Update `doc/multisig-tutorial.md` to use multipath descriptor format
  instead of separate external/internal descriptors. The tutorial now:

  - extracts a single `xpub_n` per participant
  - constructs a multipath `wsh(sortedmulti(...))` descriptor with `<0;1>`
    change index semantics
  - uses `getdescriptorinfo` to compute descriptor checksum
  - explains that `importdescriptors` expands the multipath descriptor
    into internal and external descriptors
  - update `/test/functional/wallet_multisig_descriptor_psbt.py` functional test / documentation to use multi-path descriptors

  ---

  ### Motivation

  A single multipath descriptor is the most convenient pattern for multisig; our documentation should use it.

  ---

  ### What changed

  - replaced extraction of `external_xpub_n` and `internal_xpub_n` with
    extraction of a single `xpub_n`
  - removed instructions to create and import separate external/internal
    descriptors
  - added instructions to build a multipath `wsh(sortedmulti(...))`
    descriptor and derive checksum with `getdescriptorinfo`
  - checksum field is parsed and appended as the multipath descriptor is not the canonical "desc" output
  - clarified that `importdescriptors` automatically expands multipath
    descriptors into internal and external forms
  - similar changes to the functional test: wallet_multisig_descriptor_psbt.

  ---

  ### Testing

  I have run the updated shell snippets and confirmed the multipath descriptor produces the same `listdescriptors` output after importing as the two descriptor method in bitcoin:master.

  ---

  ### Related issues / PRs

  This tutorial change references the multipath descriptor
  consolidation (see commit / PR referenced in the change). The commit
  message points to bitcoin#22838 as the upstream change that enables
  this behavior.

  ---

  ### Release note (for changelog)

  Documentation: update multisig tutorial and multisig functional test to use multipath descriptors

ACKs for top commit:
  Sjors:
    utACK de7c3587cd
  kannapoix:
    Core review ACK: de7c3587cd
  achow101:
    ACK de7c3587cd
  rkrux:
    crACK de7c3587cd

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Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

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Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.

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