fix typos in names in ack section

Author: pfps

spec/index.html

@@ -2207,8 +2207,8 @@ <h2>Acknowledgments</h2>
   <p>This specification draws upon the
     earlier specification [[RDF-MT]], whose editor acknowledged valuable
     inputs from  Jeremy Carroll, Dan Connolly, Jan Grant, R. V. Guha,
-    Herman ter Horst, Graham Klyne, Ora Lassilla, Brian McBride, Sergey
-    Melnick, Peter Patel-Schneider, Jos deRoo and Patrick Stickler. 
+    Herman ter Horst, Graham Klyne, Ora Lassila, Brian McBride, Sergey
+    Melnick, Peter Patel-Schneider, Jos De Roo and Patrick Stickler. 
     Brian McBride was the series editor for this earlier specification.</p>
 
 </section>