reference the supplemental training information in one of the documents so...

reference the supplemental training information in one of the documents so that people might actually see it

docs/training/training.md

@@ -52,3 +52,7 @@ Some areas of the Success Portal link out to [Informatica Network](https://netwo
 During some trainings, there might be mentions of setting up your own secure agent or accessing a secure agent directly.
 
 If one is using their own trial organization for training purposes, secure agents can be created using [These Instructions](./docker-secure-agent.md).
+
+## Supplemental Training Information
+
+For additional information regarding training, look at this [Supplemental Training Documentation](./training-supplements.md).