Merge bitcoin/bitcoin#30556: doc: multisig-tutorial: remove obsolete … #2723

Job	Run time
macOS 13 native, x86_64, no depends, sqlite only, gui	51m 9s
Win64 native, VS 2022	1h 57m 54s
ASan + LSan + UBSan + integer, no depends, USDT	1h 27m 38s
test each commit	0s
	4h 16m 41s

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