Refined module 2 instructions

Author: justonian

Auth/2_ServerlessAPI/README.md

@@ -246,4 +246,10 @@ Now that you've deployed the new authorizer configuration to production, all API
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-If the API now invokes correctly and application funcions as expected again, you can move either try out an **optional module extension** with [Fine-grained IAM-based authorization with API Gateway](./Optional-APIGateway-IAMAuth.md) as an optional extension or move on to the next module, [IAM-based Authorization](../3_IAMAuthorization).
+If the API now invokes correctly and application funcions as expected again, you may **proceed to complete either**:
+
+- **Optional module extension** with [Fine-grained IAM-based authorization with API Gateway](./Optional-APIGateway-IAMAuth.md)
+
+	OR
+
+- To proceed to he next module, *without completing the optional module extension*, choose [client-side IAM-based Authorization](../3_IAMAuthorization).