Drop double newlines printed in some file iteration examples.

Patch by Steven Kryskalla.
diff --git a/Doc/tutorial/classes.rst b/Doc/tutorial/classes.rst
index 95a3a83..2cc3610 100644
--- a/Doc/tutorial/classes.rst
+++ b/Doc/tutorial/classes.rst
@@ -688,7 +688,7 @@
    for char in "123":
        print char
    for line in open("myfile.txt"):
-       print line
+       print line,
 
 This style of access is clear, concise, and convenient.  The use of iterators
 pervades and unifies Python.  Behind the scenes, the :keyword:`for` statement