Man pages matching name mdebug_dump_all_symbols in section 3m17n:

mdebug_dump_all_symbols.3m17n.en	debian 10 / m17n-docs
mdebug_dump_all_symbols.3m17n.en	debian 11 / m17n-docs
mdebug_dump_all_symbols.3m17n.en	debian 12 / m17n-docs