Update to gobook@27cf7b490526a0a0751ff12ed7cc4acd8afa2edc

ch1/dup3/main.go

@@ -3,9 +3,10 @@
 
 // See page 12.
 
-// Dup3 prints the count and text of lines that appear more than once
-// in the named input files.
 //!+
+
+// Dup3 prints the count and text of lines that
+// appear more than once in the named input files.
 package main
 
 import (