aws/endpoints: Fix doc's EndpointsID to reference correct variable
Fixes the endpoint package's documentation for EndpointsID to refer to the correct variable name.
@@ -2,7 +2,7 @@ package endpoints
// Service identifiers
//
-// Deprecated: Use client package's EndpointID value instead of these
+// Deprecated: Use client package's EndpointsID value instead of these
// ServiceIDs. These IDs are not maintained, and are out of date.
const (
A4bServiceID = "a4b" // A4b.
