Updated wording

website/docs/r/pi_volumes_detach.html.markdown

@@ -12,7 +12,7 @@ Detach volumes to a Power Systems Virtual Server instance, see [volumes](https:/
 
 ## Example Usage
 
-The following example attach volumes to power virtual instance.
+The following example detach volumes from a power virtual instance.
 
 ```terraform
 resource "ibm_pi_volumes_detach" "pi_volumes_detach_instance" {