samples/kprobes: Remove misleading comment

The example file supports many architectures not only x86 and PPC.
Signed-off-by: Marc Koderer <marc@koderer.com>
Cc: trivial@kernel.org
Link: https://lore.kernel.org/r/20201228060415.2194-1-marc@koderer.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

samples/kprobes/kprobe_example.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * NOTE: This example is works on x86 and powerpc.
  * Here's a sample kernel module showing the use of kprobes to dump a
  * stack trace and selected registers when kernel_clone() is called.
  *