Remove custom credentials for snapshot and restore for oci and s3 (#520)

Author: deniseschannon

vcluster/manage/backup-restore.mdx

@@ -54,11 +54,6 @@ The following flags are supported for the `oci` protocol:
 Example how to create a snapshot to an OCI image registry:
 ```bash
 vcluster snapshot my-vcluster "oci://ghcr.io/my-user/my-repo:my-tag"
-
-# with custom credentials
-export OCI_USERNAME=my-username
-export OCI_PASSWORD=my-password
-vcluster snapshot my-vcluster "oci://ghcr.io/my-user/my-repo:my-tag?username=$OCI_USERNAME&password=$OCI_PASSWORD"
 ```
 
 #### s3
@@ -74,12 +69,6 @@ The following flags are supported for the `s3` protocol:
 Example how to create a snapshot to an s3 compatible bucket:
 ```bash
 vcluster snapshot my-vcluster "s3://my-s3-bucket/my-bucket-key"
-
-# with custom credetials
-export AWS_ACCESS_KEY_ID=my-access-key-id
-export AWS_SECRET_ACCESS_KEY=my-secret-access-key
-export AWS_SESSION_TOKEN=my-session-token
-vcluster snapshot my-vcluster "s3://my-s3-bucket/my-bucket-key?access-key-id=$AWS_ACCESS_KEY_ID&secret-access-key=$AWS_SECRET_ACCESS_KEY&session-token=$AWS_SESSION_TOKEN"
 ```
 
 #### container