ICU-22947 Update user guide for MF2 #50

Job	Run time
clang-valgrind-test	10m 6s
clang-valgrind-intltest (utility)	6m 56s
clang-valgrind-intltest (normalize)	6m 19s
clang-valgrind-intltest (collator)	5m 28s
clang-valgrind-intltest (regex)	5m 41s
clang-valgrind-intltest (format)	16m 7s
clang-valgrind-intltest (translit)	6m 46s
clang-valgrind-intltest (rbbi)	7m 39s
clang-valgrind-intltest (rbnf)	6m 29s
clang-valgrind-intltest (rbnfrt)	6m 20s
clang-valgrind-intltest (icuserv)	5m 26s
clang-valgrind-intltest (idna)	5m 15s
clang-valgrind-intltest (convert)	7m 27s
clang-valgrind-intltest (rbnfp)	5m 6s
clang-valgrind-intltest (csdet)	5m 23s
clang-valgrind-intltest (spoof)	5m 24s
clang-valgrind-intltest (bidi)	5m 21s
	1h 57m 13s

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