Changed figures for maintenance

Issue-ref: 3950

Signed-off-by: Carmen Carlan <carlan@fortiss.org>

org.fortiss.af3.rcp.help/html/assuranceCases/maintenance.html

@@ -101,12 +101,14 @@ font-style: italic;
     <ol>
       <li> Create an assurance case module; </li>
       <p> <img src="./pictures/maintenance1.PNG"></p>
-      <li> Select an argument element in the <span class="italic">Model Navigator View</span> and right-click on it. Select the <span class="bold">Set to Challenged</span> button from the opened 
+      <li> Select an argument element in the <span class="italic">Model Navigator View</span> and right-click on it. 
+      Select the <span class="bold">Set to Challenged</span> button from the opened 
 <span class="italic">Context Menu</span>; </li>
       <p> <img src="./pictures/maintenance2.PNG"></p>
       <li> The challenged solution has changed its color to red; </li>
       <p> <img src="./pictures/maintenance3.PNG"></p>
-      <li> Right-click again on the challenged argument elements. Select the <span class="bold">Show Potential Change Impact</span> button from the opened 
+      <li> Right-click again on the challenged argument element in the <span class="italic">Model Navigator View</span>. 
+      Select the <span class="bold">Show Potential Change Impact</span> button from the opened 
 <span class="italic">Context Menu</span>; </li>
       <p> <img src="./pictures/maintenance4.PNG"></p>
       <li> The potentially impacted argument elements, by the challenged