docs: add change log entry for PR#14409

changes/feat-14409.en.md

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+Add two rule functions to convert UTF-8 strings to UTF-16-little-endian for compatibility with SQL Server versions that do not support UTF-8.
+
+- Convert a UTF-8 string to UTF-16-little-endian.
+  `str_utf16_le/1`
+
+- Convert any string or Binary to SQL Server hex binary format with `0x` prefix.
+  `sqlserver_bin2hexstr/1`