Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/tile/mm/hugetlbpage.c b/arch/tile/mm/hugetlbpage.c
index 201a582..42cfcba 100644
--- a/arch/tile/mm/hugetlbpage.c
+++ b/arch/tile/mm/hugetlbpage.c
@@ -219,7 +219,7 @@
 	if (mm->free_area_cache < len)
 		goto fail;
 
-	/* either no address requested or cant fit in requested address hole */
+	/* either no address requested or can't fit in requested address hole */
 	addr = (mm->free_area_cache - len) & huge_page_mask(h);
 	do {
 		/*