perf tools: Replace lkml.org links with lore

As started by commit 05a5f51ca566 ("Documentation: Replace lkml.org
links with lore"), replace lkml.org links with lore to better use a
single source that's more likely to stay available long-term.

Signed-off-by: Kees Kook <[e-mail]>
Acked-by: Namhyung Kim <[e-mail]>
Acked-by: Peter Zijlstra <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Joe Perches <[e-mail]>
Cc: Kees Kook <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Documentation/examples.txt

···
 		****** perf by examples ******
 		------------------------------
 
-[ From an e-mail by Ingo Molnar, http://lkml.org/lkml/2009/8/4/346 ]
+[ From an e-mail by Ingo Molnar, https://lore.kernel.org/lkml/[e-mail] ]
 
 
 First, discovery/enumeration of available counters can be done via

tools/perf/util/data-convert-bt.c

···
 		goto out;
 	/*
 	 * Add '_' prefix to potential keywork.  According to
-	 * Mathieu Desnoyers (https://lkml.org/lkml/2015/1/23/652),
+	 * Mathieu Desnoyers (https://lore.kernel.org/lkml/[e-mail]),
 	 * futher CTF spec updating may require us to use '$'.
 	 */
 	if (dup < 0)