Fixed missing text object

Added logo description to alt text for better SI results and
accessibility.

Author: chabowski

adoc/SAP-EIC-Harvester-main-docinfo.xml

@@ -77,6 +77,7 @@
         <imageobject role="html">
           <imagedata fileref="suse.svg" width="152px" align="center" valign="bottom"/>
         </imageobject>
+        <textobject><phrase>SUSE logo</phrase></textobject>
     </mediaobject>
 </cover>