Chanced revision date to current one

and added revhistory description.

Author: chabowski

adoc/SLES4SAP-hana-sr-guide-costopt-15-docinfo.xml

@@ -105,6 +105,12 @@
     </cover>
 
 <revhistory xml:id="rh-art-sap-hana-srguide-costopt15">
+       <revision>
+        <date>2026-02-23</date>
+        <revdescription>
+            <para>Added anti-colocation that is needed on 15sp6 and later (TID 21629).</para>
+        </revdescription>
+    </revision>   
     <revision>
         <date>2026-02-03</date>
         <revdescription>