doc: Remove text on tracepoint samples
doc: Remove text on tracepoint samples

The tracepoint sample code got removed. Remove a few lines on its usage
too.

Acked-by: Mathieu Desnoyers <007bef6a47fb57dff675bfa1b0b798b4bdfbfc25@efficios.com>
Acked-by: Rob Landley <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@landley.net>
Acked-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>
Signed-off-by: Paul Bolle <0bda9a89324ffe2d19adec61a9f1cd9f8c8e45f0@tiscali.nl>
Signed-off-by: Jiri Kosina <ed58f755cc8caaf10c3e8c731a8b86fb8f13d6cb@suse.cz>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas