Clarify the OWNERS file

Test: gerrit
Change-Id: Ic3b6c6db1a8421f5b7892491dd69ddde4e3a8b85
diff --git a/OWNERS b/OWNERS
index 9594320..1944029 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,8 +1,11 @@
+# Current team members
 [email protected]
[email protected]
 [email protected]
 [email protected]
 [email protected]
 [email protected]
 [email protected]
 [email protected]
+
+# Former team members
[email protected]