Fix 6.5.4 html note

Author: cdujeu

dist/php/6.5.4.html

@@ -1,9 +1,10 @@
 <div style='font-family: "Open sans", "HelveticaNeue-Light","Helvetica Neue Light","Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif; font-size: 13px;line-height: 1.5em;'
      xmlns="http://www.w3.org/1999/html">
 
-    <h2>Pydio Core 6.5.3 - Beta3 for Pydio 7</h2>
+    <h2>Pydio Core 6.5.4 - RC1 for Pydio 7</h2>
+
+    This is the beta 4 for Pydio 7, a first release candidate.
 
-    This is the third beta for next major release.
     <p style="font-size: 14px;color: red;">
         <b>Please update at your own risks!! Do not update servers that are live in production!</b>
     </p>