fix(tree): correct some typos

found using codespell (https://github.com/codespell-project/codespell).

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Change-Id: I1bfa797e3460adddeefa916bb68e22beddaf6373
diff --git a/lib/xlat_tables_v2/xlat_tables_utils.c b/lib/xlat_tables_v2/xlat_tables_utils.c
index 38a375e..f3a53cc 100644
--- a/lib/xlat_tables_v2/xlat_tables_utils.c
+++ b/lib/xlat_tables_v2/xlat_tables_utils.c
@@ -585,7 +585,7 @@
 		base_va += PAGE_SIZE;
 	}
 
-	/* Ensure that the last descriptor writen is seen by the system. */
+	/* Ensure that the last descriptor written is seen by the system. */
 	dsbish();
 
 	return 0;