Merge pull request #251559 from normesta/azcopy

Addressing a Github issue

Author: prmerger-automator[bot]

articles/storage/common/storage-use-azcopy-s3.md

@@ -41,9 +41,11 @@ Gather your AWS access key and secret access key, and then set these environment
 | Operating system | Command  |
 |--------|-----------|
 | **Windows** | `set AWS_ACCESS_KEY_ID=<access-key>`<br>`set AWS_SECRET_ACCESS_KEY=<secret-access-key>` |
-| **Linux** | `export AWS_ACCESS_KEY_ID=<access-key>`<br>`export AWS_SECRET_ACCESS_KEY=<secret-access-key>` |
+| **Linux** | `export AWS_ACCESS_KEY_ID=<access-key>`<br>`export AWS_SECRET_ACCESS_KEY=<secret-access-key>`|
 | **macOS** | `export AWS_ACCESS_KEY_ID=<access-key>`<br>`export AWS_SECRET_ACCESS_KEY=<secret-access-key>`|
 
+These credentials are used to generate pre-signed URLs that are used to copy objects.
+
 ## Copy objects, directories, and buckets
 
 AzCopy uses the [Put Block From URL](/rest/api/storageservices/put-block-from-url) API, so data is copied directly between AWS S3 and storage servers. These copy operations don't use the network bandwidth of your computer.