trace-cmd: Add kernel-doc to trace_record_agent()

I'm getting confused by what exactly is being passed to
trace_record_agent(). Document it, so I can at least be only temporarily
confused.

Link: https://lore.kernel.org/linux-trace-devel/20220514024756.1319681-10-rostedt@goodmis.org

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
1 file changed