perf docs: Update link to AMD documentation

This updates the link to documentation on AMD processors.  The new link
points to a page where users can find the Processor Programming
Reference (PPR) documents for the family and model codes corresponding
to processors they are using.

Signed-off-by: Sandipan Das <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Ananth Narayan <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Kim Phillips <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Robert Richter <[email protected]>
Cc: Santosh Shukla <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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