Changed deprecation note

Author: talbring

_layouts/docs.html

@@ -11,7 +11,7 @@
         <div class="col-md-8">
             <h1>{{ page.title }}</h1>
 
-            <b><font color="red">This page is only valid for SU2 version 6.2.0 and lower.</font></b>
+            <b><font color="red">This page only applies to SU2 version 6.2.0 and lower.</font></b>
             <br>
             <b><font color="red">The new documentation section can be found </font></b><a href="{{ "/docs_v7/home" | prepend: relative_url }}">here</a>.
             <br>