doc: improvements to doc/descriptors.md #33986

1. 
   sipa commented at 4:25 pm on December 1, 2025: member

   This brings doc/descriptors.md up to date:

   • Stop trying to exhaustively list all RPCs that involve descriptors. They’re used everywhere.
   • Stop trying to give the history of descriptor support, we have release notes for that.
   • Mention that wallets are now built around descriptors (especially with legacy wallets gone).
   • Mention musig() KEY expressions in the specification part.
   • Reference the relevant output descriptor BIPs in the text.
2. doc: mention musig() in descriptors.md ee686aca0b
3. doc: do not list descriptor RPCs or history 1e954051ad
4. doc: reference descriptor BIPs in descriptors.md fc33626f66
5. DrahtBot added the label Docs on Dec 1, 2025
6. 
   DrahtBot commented at 4:25 pm on December 1, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33986.

   Reviews

   See the guideline for information on the review process. A summary of reviews will appear here.

   LLM Linter (✨ experimental)

   Possible typos and grammar issues:

   • P2SH embed the argument. -> P2SH embeds the argument. [subject-verb agreement; “P2SH” (singular) requires “embeds”]
   • P2WSH embed the argument. -> P2WSH embeds the argument. [subject-verb agreement; “P2WSH” (singular) requires “embeds”]

   2025-12-01

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