Man pages matching name mlx5dv_create_flow_action_modify_header in section 3:

mlx5dv_create_flow_action_modify_header.3.en	debian 10 / libibverbs-dev
mlx5dv_create_flow_action_modify_header.3.en	debian 11 / libibverbs-dev
mlx5dv_create_flow_action_modify_header.3.en	debian 12 / libibverbs-dev