perf docs: Document tool and hwmon events

Add a few paragraphs on tool and hwmon events.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Yoshihiro Furudera <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ze Gao <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Junhao He <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: James Clark <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Athira Jajeev <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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