Fixup changelog formatting

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/ChangeLog.d/make_base64_table_access_constant_flow.txt b/ChangeLog.d/make_base64_table_access_constant_flow.txt
index a119389..733c972 100644
--- a/ChangeLog.d/make_base64_table_access_constant_flow.txt
+++ b/ChangeLog.d/make_base64_table_access_constant_flow.txt
@@ -1,4 +1,4 @@
 Security
    * Guard against strong local side channel attack against base64 tables by
-    making access aceess to them use constant flow code.
+     making access aceess to them use constant flow code.