tracing: Fix comments about trace/ftrace.h

commit f42c85e7 moved tracepoint's ftrace
creation into include/trace/ftrace.h and trace/define_trace.h was deleted
as a result. However some comment info does not adapt to the change, which
is such a misguiding when reading related code.

This patch fix this by moving trace/trace_events.h to <trace/events/XXX.h>,
since tracepoint headers have already been moved to tarce/events/.

Link: http://lkml.kernel.org/r/1425419298-61941-1-git-send-email-houpengyang@huawei.comSigned-off-by: Hou Pengyang <houpengyang@huawei.com>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

include/trace/trace_events.h

@@ -2,7 +2,8 @@
 /*
  * Stage 1 of the trace events.
  *
- * Override the macros in <trace/trace_events.h> to include the following:
+ * Override the macros in the event tracepoint header <trace/events/XXX.h>
+ * to include the following:
  *
  * struct trace_event_raw_<call> {
  *	struct trace_entry		ent;
@@ -223,7 +224,8 @@ TRACE_MAKE_SYSTEM_STR();
 /*
  * Stage 3 of the trace events.
  *
- * Override the macros in <trace/trace_events.h> to include the following:
+ * Override the macros in the event tracepoint header <trace/events/XXX.h>
+ * to include the following:
  *
  * enum print_line_t
  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
@@ -555,7 +557,8 @@ static inline notrace int trace_event_get_offsets_##call(		\
 /*
  * Stage 4 of the trace events.
  *
- * Override the macros in <trace/trace_events.h> to include the following:
+ * Override the macros in the event tracepoint header <trace/events/XXX.h>
+ * to include the following:
  *
  * For those macros defined with TRACE_EVENT:
  *