Update the TPM doc

doc/source/admin/emulated-tpm.rst

@@ -3,9 +3,6 @@ Emulated Trusted Platform Module (vTPM)
 #######################################
 
 
-Starting in the 22.0.0 (Victoria) release, Nova supports adding an emulated virtual
-Trusted Platform Module (vTPM) to guests.
-
 The vTPM feature is enabled by default, so just verify and configure the flavor with
 vTPM.
 
@@ -21,6 +18,8 @@ Verify vTPM support by inspecting the traits on the compute node’s resource pr
  | COMPUTE_SECURITY_TPM_1_2 |
  | COMPUTE_SECURITY_TPM_2_0 |
 
+$HOST represents the hostname of the compute node where you want to verify vTPM support.
+
 
 Configuring a flavor or image
 =============================
@@ -39,6 +38,14 @@ For example, to configure a flavor to use the TPM 2.0 with the CRB model:
     --property hw:tpm_version=2.0 \
     --property hw:tpm_model=tpm-crb
 
+To configure a image to use the TPM 2.0 with CRB model:
+
+.. code-block:: console
+
+   $ openstack image set <image-name-or-uuid> \
+    --property hw:tpm_version=2.0 \
+    --property hw:tpm_model=tpm-crb
+
 
 Create an instance with vTPM
 ============================