Update xml/cha_images.xml

Co-authored-by: Tom Schraitle <tomschr@users.noreply.github.com>

Author: schaefi

xml/cha_images.xml

@@ -895,7 +895,7 @@
          </para>
          <programlisting language="bash" linenumbering="unnumbered">
 # Instruct the enclave to return the PCRs from the enclave's attestation document
-$ vsock_client Enclave-CID
+&prompt.user;vsock_client Enclave-CID
          </programlisting>
          <para>
            Matching the enclave's PCRs with the output of