ftrace: ftrace.txt version update

Impact: Documentation update only

Update the version that the ftrace document was written for.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/ftrace.txt b/Documentation/ftrace.txt
index 0cb989c..9cc4d68 100644
--- a/Documentation/ftrace.txt
+++ b/Documentation/ftrace.txt
@@ -8,7 +8,7 @@
 Reviewers:   Elias Oltmanns, Randy Dunlap, Andrew Morton,
 	     John Kacur, and David Teigland.
 
-Written for: 2.6.27-rc1
+Written for: 2.6.28-rc2
 
 Introduction
 ------------