ICU-22774 Fix URL typo in error message #2999

Job	Run time
clang-valgrind-intltest (utility)	6m 40s
clang-valgrind-test	10m 15s
clang-valgrind-intltest (normalize)	6m 21s
clang-valgrind-intltest (collator)	5m 35s
clang-valgrind-intltest (regex)	5m 45s
clang-valgrind-intltest (format)	16m 17s
clang-valgrind-intltest (translit)	6m 0s
clang-valgrind-intltest (rbbi)	7m 43s
clang-valgrind-intltest (rbnf)	6m 35s
clang-valgrind-intltest (rbnfrt)	6m 14s
clang-valgrind-intltest (icuserv)	5m 12s
clang-valgrind-intltest (idna)	5m 16s
clang-valgrind-intltest (convert)	7m 5s
clang-valgrind-intltest (rbnfp)	6m 5s
clang-valgrind-intltest (csdet)	5m 22s
clang-valgrind-intltest (spoof)	5m 2s
clang-valgrind-intltest (bidi)	5m 44s
	1h 57m 11s

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