updated x86_64 to v2

* updated  x86_64 to v2

Author: tbazant

references/alp-requirements.xml

@@ -39,7 +39,7 @@
         <term>CPU</term>
         <listitem>
           <para>
-            &x86-64;, &aarch64; and &zseries; CPU architectures are supported.
+            &x86-64; v2, &aarch64; and &zseries; CPU architectures are supported.
           </para>
         </listitem>
       </varlistentry>