[Sync EN] Add packagesynopsis tag for BCMath, FFI and PDO classes

[github-actions]

PR: https://github.com/php/doc-en/pull/5406 (2026-03-08)

Файлы RU для обновления

• reference/bc/bcmath.number.xml
• reference/ffi/ffi.cdata.xml
• reference/ffi/ffi.ctype.xml
• reference/ffi/ffi.exception.xml
• reference/ffi/ffi.parserexception.xml
• reference/pdo_dblib/pdo-dblib.xml
• reference/pdo_firebird/pdo-firebird.xml
• reference/pdo_odbc/pdo-odbc.xml
• reference/pdo_pgsql/pdo-pgsql.xml