tracing: Add documentation of snapshot utility
This patch adds snapshot description in ftrace documentation. This description includes what the snapshot is and how to use it. Link: http://lkml.kernel.org/r/20121226025309.3252.150.stgit@liselsia Cc: Rob Landley <rob@landley.net> Signed-off-by: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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