Rename disjoint-set vocab to disjoint-sets

extra/disjoint-sets/disjoint-sets.factor

@@ -1,6 +1,8 @@
+! Copyright (C) 2008 Eric Mertens.
+! See http://factorcode.org/license.txt for BSD license.
 USING: accessors arrays hints kernel locals math sequences ;
 
-IN: disjoint-set
+IN: disjoint-sets
 
 <PRIVATE
 

extra/project-euler/186/186.factor

@@ -1,4 +1,4 @@
-USING: circular disjoint-set kernel math math.ranges
+USING: circular disjoint-sets kernel math math.ranges
        sequences sequences.lib ;
 IN: project-euler.186