add suggestion in workloads-config

perfmetrics/scripts/testing_on_gke/examples/workloads.json

@@ -16,7 +16,7 @@
             "readTypes": ["read","randread"]
           },
           "gcsfuseMountOptions": "implicit-dirs",
-          "bucket":"The bucket must have objects with name Workload.{i}/{j} for every i,j where i:0-{numThreads}-1, j:0-{filesPerThread}-1, and each of these objects must be of size {fileSize}. The buckets gke-* are all in us-central1, are owned by GKE team and are in their GCP project(s)."
+          "bucket":"The bucket must have objects with name Workload.{i}/{j} for every i,j where i:0-{numThreads}-1, j:0-{filesPerThread}-1, and each of these objects must be of size {fileSize}. The buckets gke-* are all in us-central1, are owned by GKE team and are in their GCP project(s). For best performance, please ensure that the bucket is in the same google-cloud region and GCP project as that of the GKE cluster used for running this test configuration."
         },
         {
           "_fioWorkload": {
@@ -180,7 +180,7 @@
             "batchSizes": [800,128]
           },
           "gcsfuseMountOptions": "implicit-dirs",
-          "bucket":"The bucket must have objects with name 'train/', 'valid/', and train/img_{i}_of_{numFilesTrain}.npz for every i where i:0-{numFilesTrain}-1 and each train/img_{i}_of_{numFilesTrain}.npz must be of size {recordLength} bytes. The buckets gke-* are all in us-central1, are owned by GKE team and are in their GCP project(s)."
+          "bucket":"The bucket must have objects with name 'train/', 'valid/', and train/img_{i}_of_{numFilesTrain}.npz for every i where i:0-{numFilesTrain}-1 and each train/img_{i}_of_{numFilesTrain}.npz must be of size {recordLength} bytes. The buckets gke-* are all in us-central1, are owned by GKE team and are in their GCP project(s). For best performance, please ensure that the bucket is in the same google-cloud region and GCP project as that of the GKE cluster used for running this test configuration."
         },
         {
           "_dlioWorkload": {