Update README.md: add region, improve readability.

This change includes two changes:
1) mentioning that the resources will go into 'west'
2) all of the bucket names were on one line, and were unreadable

aws/projects/ditd-darhts/README.md

@@ -13,15 +13,14 @@
 
 ## DARHTS buckets
 
-Three buckets per environment, for the following purposes:
+Three buckets per environment, in the 'west' region, for the following purposes:
 
-* in: uploaded files from DARHTS Salesforce
+* in: uploaded files from DARHTS 
+  * v-s3-ditd-darhts-{env}-in-{account}-{region-short}
 * clean: after s3 scan, files which do not have threats are moved here via EventBridge and Lambda
+  * v-s3-ditd-darhts-{env}-clean-{account}-{region-short}
 * quarantine: after s3 scan, files which may have threats or are unknown types (not no_threats) are moved here via EventBridge and Lambda
-
-v-s3-ditd-darhts-{env}-in-{account}-{region-short}
-v-s3-ditd-darhts-{env}-clean-{account}-{region-short}
-v-s3-ditd-darhts-{env}-quarantine-{account}-{region-short}
+  * v-s3-ditd-darhts-{env}-quarantine-{account}-{region-short}
 
 The `clean` bucket will need versioning turned on for replication to the DAPPS bucket (below)
 All 3 buckets will use a bucket-specific KMS key.