Update xml/vm_security.xml

Co-authored-by: Daria Vladykina <[email protected]>

xml/vm_security.xml

@@ -152,7 +152,7 @@ You can run AMD SEV-SNP protected virtual machines using the &libvirt; framework
 </step>
 <step>
 <para>
-To protect the virtual machine with AMD SEV-SNP, set the correct firmware by modifying the &lt;os&gt; section as given below:</para>
+To protect the virtual machine with AMD SEV-SNP, set the correct firmware by modifying the <literal>os</literal> section as given below:</para>
 <screen>
 &lt;os&gt;
 &lt;type arch="x86_64" machine="pc-q35-8.2"&gt;hvm /type&gt;