trace-cmd: Document trace file version 7

Trace file versions 6 and 7 have a lot of differences. Added new man
page describing the version 7 and renamed the existing trace-cmd.dat
page for version 6 only.

Link: https://lore.kernel.org/linux-trace-devel/20220126095530.571035-5-tz.stoyanov@gmail.com

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2 files changed