Man pages matching name pcre_utf16_to_host_byte_order in section 3:

pcre_utf16_to_host_byte_order.3.en	debian 10 / libpcre3-dev
pcre_utf16_to_host_byte_order.3.en	debian 11 / libpcre3-dev
pcre_utf16_to_host_byte_order.3.en	debian 12 / libpcre3-dev