iommufd: Correct IOMMU_HWPT_ALLOC_NEST_PARENT description

mainline inclusion
from mainline-v6.7-rc1
commit b5f9e63278d6f32789478acf1ed41d21d92b36cf
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8Y6AM
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?b5f9e63278d6f32789478acf1ed41d21d92b36cf

--------------------------------

The IOMMU_HWPT_ALLOC_NEST_PARENT flag is used to allocate a HWPT. Though
a HWPT holds a domain in the core structure, it is still quite confusing
to describe it using "domain" in the uAPI kdoc. Correct it to "HWPT".

Intel-SIG: b5f9e63278d6 iommufd: Correct IOMMU_HWPT_ALLOC_NEST_PARENT description
Backport IOMMUFD Dirty Tracking

Fixes: 4ff542163397 ("iommufd: Support allocating nested parent domain")
Link: https://lore.kernel.org/r/20231017181552.12667-1-nicolinc@nvidia.com


Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
[ jz: amend commit log ]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>