Fix comment typos.

Change-Id: I8d101c18f80c51f7021929ae103f8691427753a4
diff --git a/inc/hf/mm.h b/inc/hf/mm.h
index aebe77d..f7c4d9d 100644
--- a/inc/hf/mm.h
+++ b/inc/hf/mm.h
@@ -86,7 +86,7 @@
 	paddr_t root;
 };
 
-/** Represents the curretly locked stage-1 page table of the hypervisor. */
+/** Represents the currently locked stage-1 page table of the hypervisor. */
 struct mm_stage1_locked {
 	struct mm_ptable *ptable;
 };