Fix test_boot_cloned_encrypted_volume docstring

Updated the docstring description for test_boot_cloned_encrypted_volume
function to an accurate one.


Closes-Bug:2006594
Change-Id: I5e6e5444388acccb85d74d8ab2a22c8d988cfb5b
diff --git a/cinder_tempest_plugin/scenario/test_volume_encrypted.py b/cinder_tempest_plugin/scenario/test_volume_encrypted.py
index 69edfa6..eb0e817 100644
--- a/cinder_tempest_plugin/scenario/test_volume_encrypted.py
+++ b/cinder_tempest_plugin/scenario/test_volume_encrypted.py
@@ -122,9 +122,8 @@
         * Create an encrypted volume from image
         * Boot an instance from the volume
         * Write data to the volume
-        * Detach volume
-        * Create a clone from the first volume
-        * Create another encrypted volume from source_volumeid
+        * Destroy the instance
+        * Create a clone of the encrypted volume
         * Boot an instance from cloned volume
         * Verify the data
         """