Added docs for Setty.new-from-pairs. viki++

Author: Jan-Olof Hendig

doc/Type/Setty.pod6

@@ -11,6 +11,22 @@ See L<Set> and L<SetHash>.
 
 =head1 Methods
 
+=head2 method new-from-pairs
+
+Defined as:
+
+    method new-from-pairs(*@pairs) returns Setty:D
+
+Constructs a Setty object from a list of L«C<Pair> objects|/type/Pair»
+given as positional arguments:
+
+    say Set.new-from-pairs: 'butter' => 0.22, 'salt' => 0, 'sugar' => 0.02;
+    # OUTPUT:
+    # set(butter, sugar)
+
+B<Note:> be sure you aren't accidentally passing the Pairs as positional arguments;
+the quotes around the keys in the above example are significant.
+
 =head2 method grab
 
     method grab($count = 1)