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

tools/perf/Documentation/perf-intel-pt.txt

@@ -1471,6 +1471,13 @@ In that case the --itrace q option is forced because walking executable code
 to reconstruct the control flow is not possible.
 
 
+EXAMPLE
+-------
+
+Examples can be found on perf wiki page "Perf tools support for Intel® Processor Trace":
+
+https://perf.wiki.kernel.org/index.php/Perf_tools_support_for_Intel%C2%AE_Processor_Trace
+
 
 SEE ALSO
 --------