release-73-2
ICU-21814 Fix small typos in docs/userguide
ICU-21580 change site.icu-project.org to icu.unicode.org etc
ICU-20088 fix code, tables, typos, broken links, add code styling
ICU-21148 Consistently use standard lowercase true/false everywhere.
ICU-20088 User Guide migration: Add navigation structure and TOC for Jekyll, fix formatting issues, etc.
ICU-21310 replacement User Guide main index page
ICU-21710 Remove BOYER_MOORE dead code from usearch.cpp