Fixes the page of the Studia plugin.

_fc-plugins/studia.html

@@ -18,7 +18,7 @@ key: browsing
   <dt class="subTitle">Quick Start</dt>
 
   <dd>
-	<p><code>$ frama-c-gui -val studia.c</code></p>
+	<p><code>$ frama-c-gui -eva studia.c</code></p>
 
 	<p>Right-click on an expression in the code and choose the <strong>Studia</strong> context menu to access its
 	features.</p><img class="size-full wp-image-640" src="/assets/img/plugins/studia-img.png" alt="" width="630" height="189"
@@ -64,4 +64,4 @@ key: browsing
   <dd>
 	<p>Automatically enabled after running EVA and opening the GUI.</p>
   </dd>
-</dl>
\ No newline at end of file
+</dl>