tracing: Add missing function triggers dump and cpudump to README

The debugfs tracing README file lists all the function triggers except for
dump and cpudump. These should be added too.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 9be67c5..e3e6656 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3611,6 +3611,8 @@
 #ifdef CONFIG_TRACER_SNAPSHOT
 	"\t\t      snapshot\n"
 #endif
+	"\t\t      dump\n"
+	"\t\t      cpudump\n"
 	"\t     example: echo do_fault:traceoff > set_ftrace_filter\n"
 	"\t              echo do_trap:traceoff:3 > set_ftrace_filter\n"
 	"\t     The first one will disable tracing every time do_fault is hit\n"