mm/hugetlb.c: fix typos in comments

Fix typo in comment.

Link: https://lkml.kernel.org/r/1612256106-9436-1-git-send-email-daizhiyuan@phytium.com.cnSigned-off-by: Zhiyuan Dai <daizhiyuan@phytium.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb.c

@@ -4028,7 +4028,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
 
 /*
  * This is called when the original mapper is failing to COW a MAP_PRIVATE
- * mappping it owns the reserve page for. The intention is to unmap the page
+ * mapping it owns the reserve page for. The intention is to unmap the page
  * from other VMAs and let the children be SIGKILLed if they are faulting the
  * same region.
  */