doc: multisig-tutorial: remove obsolete mention and link to closed PR #30556

1. 
   MarnixCroes commented at 10:41 am on July 31, 2024: contributor

   Remove the mention and link as the PR (https://github.com/bitcoin/bitcoin/pull/22341) is closed and the description is wrong/outdated anyway.
2. doc: remove obsolete mention and link to closed PR 3cd24aadb2
3. 
   DrahtBot commented at 10:41 am on July 31, 2024: contributor

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4. DrahtBot added the label Docs on Jul 31, 2024
5. BrandonOdiwuor approved
6. 
   BrandonOdiwuor commented at 2:04 pm on July 31, 2024: contributor

   ACK 3cd24aadb25c1fbdca725c906e0fca79d090ebdd
7. tdb3 approved
8. 
   tdb3 commented at 4:24 pm on July 31, 2024: contributor

   ACK 3cd24aadb25c1fbdca725c906e0fca79d090ebdd
9. fanquake merged this on Jul 31, 2024
10. fanquake closed this on Jul 31, 2024

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11. MarnixCroes deleted the branch on Aug 1, 2024

Contributors
MarnixCroes DrahtBot BrandonOdiwuor tdb3

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