removed duplicate word "The" in comment.

src/about_sandwich_code.rb

@@ -40,7 +40,7 @@ def test_finding_lines
   #
   # Sandwich code is code that comes in three parts: (1) the top slice
   # of bread, (2) the meat, and (3) the bottom slice of bread.  The
-  # the bread part of the sandwich almost always goes together, but
+  # bread part of the sandwich almost always goes together, but
   # the meat part changes all the time.
   #
   # Because the changing part of the sandwich code is in the middle,