ICU-22533 Update BRS instructions for tagging release #62

Job	Run time
clang-valgrind-test	10m 23s
clang-valgrind-intltest (utility)	1s
clang-valgrind-intltest (normalize)	5m 46s
clang-valgrind-intltest (collator)	6m 11s
clang-valgrind-intltest (regex)	5m 28s
clang-valgrind-intltest (format)	1s
clang-valgrind-intltest (translit)	6m 8s
clang-valgrind-intltest (rbbi)	8m 54s
clang-valgrind-intltest (rbnf)	9m 56s
clang-valgrind-intltest (rbnfrt)	6m 17s
clang-valgrind-intltest (icuserv)	5m 14s
clang-valgrind-intltest (idna)	4m 59s
clang-valgrind-intltest (convert)	6m 19s
clang-valgrind-intltest (rbnfp)	4m 50s
clang-valgrind-intltest (csdet)	5m 56s
clang-valgrind-intltest (spoof)	5m 1s
clang-valgrind-intltest (bidi)	5m 19s
	1h 36m 43s

Provide feedback