Update backup-rbac-rs-vault.md

-------
cc: @v-amallick

Author: mepand

articles/backup/backup-rbac-rs-vault.md

@@ -92,7 +92,7 @@ The following table captures the Backup management actions and corresponding Azu
 | Enable backup from file share blade | Backup Contributor | Recovery Services vault |
 | | Storage account Contributor | Storage account Resource |
 | | Contributor | Subscription |
-| On-demand backup of VM | Backup Operator | Recovery Services vault |
+| On-demand backup of file share | Backup Operator | Recovery Services vault |
 | Restore File share | Backup Operator | Recovery Services vault |
 | | Storage Account Backup Contributor | Storage account resources where restore source and Target file shares are present |
 | Restore Individual Files | Backup Operator | Recovery Services vault |