add comments for scenario in helm values for pod configs

Author: gargnitingoogle

perfmetrics/scripts/testing_on_gke/examples/dlio/unet3d-loading-test/values.yaml

@@ -19,6 +19,7 @@
 
 image: jiaxun/dlio:v1.2.0
 bucketName: gke-dlio-test-data
+# scenario controls the kind of storage that is used for the load testing. local-ssd means directly on LSSD; gcsfuse-generic means on a gcsfuse mount with gcsfuse.mountOptions sent from the caller; gcsfuse-no-file-cache and gcsfuse-file-cache mean as their name suggests.
 scenario: local-ssd
 nodeType: n2-standard-96
 

perfmetrics/scripts/testing_on_gke/examples/fio/loading-test/values.yaml

@@ -19,6 +19,7 @@
 
 image: ubuntu:24.04
 bucketName: gke-dlio-test-data
+# scenario controls the kind of storage that is used for the load testing. local-ssd means directly on LSSD; gcsfuse-generic means on a gcsfuse mount with gcsfuse.mountOptions sent from the caller; gcsfuse-no-file-cache and gcsfuse-file-cache mean as their name suggests.
 scenario: local-ssd
 nodeType: n2-standard-96