Agama-based install: Metadata update/fix

Author: cwickert

articles/agama-based-installation.asm.xml

@@ -69,6 +69,7 @@
       <revhistory xml:id="rh-sle-agama-installation-x86-64">
         <revision><date>2025-04-11</date>
           <revdescription>
+            <!-- briefly sum up the major changes for the reader-->
             <para>
               Updated for &productname; 16.0 Beta 2
             </para>
@@ -91,8 +92,13 @@
       </revhistory>
       <!-- TODO: provide a listing of possible and validatable meta entry values. Maybe in our geekodoc repo? -->
       <!-- add author's e-mail -->
-      <meta name="christoph.wickert@suse.com" content="" its:translate="no"/>
-      <meta name="architecture"><phrase>&x86-64;</phrase>
+      <meta name="maintainer" content="christoph.wickert@suse.com" its:translate="no"/>
+      <meta name="architecture">
+        <!-- cwickert 2025-04-11: No ARM instructions yet, commented out -->
+        <!-- <phrase>&aarch64;</phrase>-->
+        <phrase>&ppc64le;</phrase>
+        <phrase>&x86-64;</phrase>
+        <phrase>&zseries;</phrase>
       </meta>
       <!-- enter one or more product names and version -->
       <meta name="productname" its:translate="no"><productname version="16.0 Beta">&productname;</productname>