Fix broken ICU link in intl.configuration documentation #264
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The old ICU Locale Explorer link (https://icu4c-demos.unicode.org/icu-bin/locexp) is no longer available.
Replaced it with the official and maintained ICU documentation page: https://unicode-org.github.io/icu/userguide/locale/
This page provides up-to-date information about locale handling in ICU, which is more relevant and stable for the intl extension documentation.
Issue: php/doc-en#4884