add place for A64FX in table

Author: laraPPr

docs/available_software/overview.md

@@ -7,11 +7,11 @@ This table gives an overview of all the available software in EESSI per specific
     <thead>
         <tr>
             <th rowspan="3">Name</th>
-            <th colspan="4">aarch64</th>
+            <th colspan="5">aarch64</th>
             <th colspan="9">x86_64</th>
         </tr>
         <tr>
-            <th colspan="3"></th>
+            <th colspan="4"></th>
             <th colspan="1">nvidia</th>
             <th colspan="1"></th>
             <th colspan="3">amd</th>
@@ -31,6 +31,7 @@ This table gives an overview of all the available software in EESSI per specific
             <th colspan="1"></th>
             <th colspan="1"></th>
             <th colspan="1"></th>
+            <th colspan="1"></th>
         </tr>
     </thead>
 </table>