Clarify when using print() is the right use or not.

test/normalizer_issue_files/python2.7.py

@@ -4,3 +4,7 @@ print 1, 2 >> sys.stdout
 
 
 foo = ur'This is not possible in Python 3.'
+
+# This is actually printing a tuple.
+#: E275:5
+print(1, 2)

test/normalizer_issue_files/python3.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 from typing import ClassVar, List
 
+print(1, 2)
 
 # Annotated function (Issue #29)
 def foo(x: int) -> int: