Update index.html

Author: georghinkel

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@@ -11,7 +11,7 @@ <h2>17th Transformation Tool Contest</h2>
           A contest for users and developers of transformation tools.
         </p>
 
-        <p>Part of the Software Technologies: Applications and Foundations (STAF)
+        <p>Planned to be part of the Software Technologies: Applications and Foundations (STAF)
         federated conferences.</p>
 
         <p>Hosted at Rennes on TBD, as part of <a href="https://conf.researchr.org/home/staf-2026">STAF 2026</a>.</p>