tracing: Add example and documentation for new __vstring() macro
Update the sample trace events to include an example that uses the new __vstring() helpers for TRACE_EVENTS. Link: https://lkml.kernel.org/r/20220715175555.16375a3b@gandalf.local.homeSigned-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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