fixed the header of the HTML

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

Author: PeterStaar-IBM

docling_eval/docling/constants.py

@@ -357,7 +357,7 @@
 
     <!-- Embedded Image -->
     <div class="container">
-        <div class="title">Page Image Groundtruth</div>
+        <div class="title">Page Image Prediction</div>
         <img src="data:image/png;base64,BASE64PREDPAGE" alt="Example Image">
     </div>