update SEM-DISNET diagram

SEM-DISNET Documentation/index-en.html

@@ -537,7 +537,7 @@ This ontology has the following classes and properties.</span>
       This diagram follows the <a href="https://chowlk.linkeddata.es/">Chowlk notation</a>.</p>
 
       <center>
-         <img src="SEM-DISNET_ontology.png" alt="General overview of the SEM-DISNET Ontology." width="90%"> <figcaption><b>Figure 1</b> - SEM-DISNET schema for the representation of DISNET data.</figcaption>
+         <img src="SEM-DISNET_ontology2.png" alt="General overview of the SEM-DISNET Ontology." width="90%"> <figcaption><b>Figure 1</b> - SEM-DISNET schema for the representation of DISNET data.</figcaption>
       </center>
 
       <p>  SEM-DISNET Ontology is built mostly from the reuse of existing ontology concepts. Mainly, it is based on the