perf intel-pt: Add link to the perf wiki's Intel PT page

Add an EXAMPLE section and link to the perf wiki's Intel PT page.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/20220426133213.248475-1-adrian.hunter@intel.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>