ICU-22533 Update BRS instructions for tagging release #35

Job	Run time
clang-valgrind-test	10m 13s
clang-valgrind-intltest (utility)	7m 40s
clang-valgrind-intltest (normalize)	7m 20s
clang-valgrind-intltest (collator)	8m 38s
clang-valgrind-intltest (regex)	5m 22s
clang-valgrind-intltest (format)	16m 33s
clang-valgrind-intltest (translit)	6m 11s
clang-valgrind-intltest (rbbi)	8m 15s
clang-valgrind-intltest (rbnf)	11m 0s
clang-valgrind-intltest (rbnfrt)	6m 6s
clang-valgrind-intltest (icuserv)	7m 19s
clang-valgrind-intltest (idna)	6m 54s
clang-valgrind-intltest (convert)	8m 32s
clang-valgrind-intltest (rbnfp)	5m 4s
clang-valgrind-intltest (csdet)	5m 15s
clang-valgrind-intltest (spoof)	6m 29s
clang-valgrind-intltest (bidi)	5m 27s
	2h 12m 18s

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