typo fix

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1553 e5f2f494-b856-4b98-b285-d166d9295462

doc/userguide/userguide.xml

@@ -536,7 +536,7 @@ var/
           <screen>$ <userinput>make install</userinput></screen>
         </para>
         <note>
-          <para>The install step may require superuserprivileges.</para>
+          <para>The install step may require superuser privileges.</para>
         </note>
 
       </section>