Merge pull request #1590 from andyzhangx/update-inline-volume-doc

doc: update inline volume doc

deploy/example/e2e_usage.md

@@ -133,7 +133,8 @@ In the above example, there is a `/mnt/blob` directory mounted as `blobfuse` fil
 
 #### Option#3: Inline volume
  > - inline volume does not support nfs protocol
- > - to avoid performance issue, use persistent volume instead of inline volume when numerous pods are accessing the same volume.
+ > - to avoid performance issue, use persistent volume instead of inline volume when numerous pods are accessing the same volume
+ > - `secretNamespace` parameter is not required since the secret must be in the same namespace as pod
  - in below blobfuse mount example, create `azure-secret` with existing storage account name and key in the same namespace as pod, both secret and pod are in `default` namespace
 ```console
 kubectl create secret generic azure-secret --from-literal azurestorageaccountname=NAME --from-literal azurestorageaccountkey="KEY" --type=Opaque