[4.0] 47bb3c7 Update description

[Lasse Karstensen]

commit 47bb3c7890ae95900f76bd02253332e5e03cf48d
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Wed Jul 30 23:36:23 2014 +0100

    Update description
    
    obj.{grace,ttl} are read-only.

diff --git a/lib/libvcc/generate.py b/lib/libvcc/generate.py
index a2947c6..3d56bc5 100755
--- a/lib/libvcc/generate.py
+++ b/lib/libvcc/generate.py
@@ -550,14 +550,13 @@ sp_variables = [
 		( 'hit', ),
 		( ), """
 		The object's remaining time to live, in seconds.
-		obj.ttl is writable.
 		"""
 	),
 	('obj.grace',
 		'DURATION',
 		( 'hit', ),
 		( ), """
-		The object's grace period in seconds. obj.grace is writable.
+		The object's grace period in seconds.
 		"""
 	),
 	('obj.keep',