Fix most trivially-findable print statements.

There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.

(Oh, and I don't know if the compiler package works.)
diff --git a/Lib/DocXMLRPCServer.py b/Lib/DocXMLRPCServer.py
index ddd5604..fd3b2c9 100644
--- a/Lib/DocXMLRPCServer.py
+++ b/Lib/DocXMLRPCServer.py
@@ -270,9 +270,9 @@
 
         response = self.generate_html_documentation()
 
-        print 'Content-Type: text/html'
-        print 'Content-Length: %d' % len(response)
-        print
+        print('Content-Type: text/html')
+        print('Content-Length: %d' % len(response))
+        print()
         sys.stdout.write(response)
 
     def __init__(self):