Man pages matching name mlx5dv_devx_free_uar in section 3:

mlx5dv_devx_free_uar.3.en	debian 10 / libibverbs-dev
mlx5dv_devx_free_uar.3.en	debian 11 / libibverbs-dev
mlx5dv_devx_free_uar.3.en	debian 12 / libibverbs-dev