Fix typo in example

core/sequences/sequences-docs.factor

@@ -334,7 +334,7 @@ HELP: if-empty
 { $values { "seq" sequence } { "quot1" quotation } { "quot2" quotation } }
 { $description "Makes an implicit check if the sequence is empty. An empty sequence is dropped and " { $snippet "quot1" } " is called. Otherwise, if the sequence has any elements, " { $snippet "quot2" } " is called on it." }
 { $example
-    "USING: kernel prettyprint sequences sequences.lib ;"
+    "USING: kernel prettyprint sequences ;"
     "{ 1 2 3 } [ \"empty sequence\" ] [ sum ] if-empty ."
     "6"
 } ;