iommufd: Fix comment typos

Repair some typos in comments that were noticed late in the review
cycle.

Fixes: f394576e ("iommufd: PFN handling for iopt_pages")
Link: https://lore.kernel.org/r/1-v1-0362a1a1c034+98-iommufd_fixes1_jgg@nvidia.comReviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Binbin Wu <binbin.wu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/iommu/iommufd/io_pagetable.h

@@ -33,7 +33,7 @@ struct iommu_domain;
  *
  * The io_pagetable::iova_rwsem protects node
  * The iopt_pages::mutex protects pages_node
- * iopt and immu_prot are immutable
+ * iopt and iommu_prot are immutable
  * The pages::mutex protects num_accesses
  */
 struct iopt_area {

drivers/iommu/iommufd/pages.c

@@ -342,7 +342,7 @@ static void batch_destroy(struct pfn_batch *batch, void *backup)
 		kfree(batch->pfns);
 }
 
-/* true if the pfn could be added, false otherwise */
+/* true if the pfn was added, false otherwise */
 static bool batch_add_pfn(struct pfn_batch *batch, unsigned long pfn)
 {
 	const unsigned int MAX_NPFNS = type_max(typeof(*batch->npfns));
@@ -418,7 +418,7 @@ static struct page **raw_pages_from_domain(struct iommu_domain *domain,
 	return out_pages;
 }
 
-/* Continues reading a domain until we reach a discontiguity in the pfns. */
+/* Continues reading a domain until we reach a discontinuity in the pfns. */
 static void batch_from_domain_continue(struct pfn_batch *batch,
 				       struct iommu_domain *domain,
 				       struct iopt_area *area,