[4.1] c231bda Further improve do_stream documentation

[PÃ¥l Hermunn Johansen]

commit c231bdafa942b1b3c079056341e75b008da088ea
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Tue Aug 23 15:43:22 2016 +0200

    Further improve do_stream documentation
    
    Thanks, Dridi
    
    Addresses question in #2038

diff --git a/lib/libvcc/generate.py b/lib/libvcc/generate.py
index d8eacf6..7c09ba6 100755
--- a/lib/libvcc/generate.py
+++ b/lib/libvcc/generate.py
@@ -490,8 +490,9 @@ sp_variables = [
 		('backend_response', 'backend_error'),
 		('backend_response', 'backend_error'), """
 		Deliver the object to the client while fetching the whole
-		object into varnish. If this request is pass'ed it will not be
-		stored in memory.
+		object into varnish. For uncacheable objects, storage for
+		parts of the body which have been sent to the client may
+		get freed early, depending on the storage engine used.
 		"""
 	),
 	('beresp.do_gzip',