perf intel-pt: Fix itrace defaults for perf script intel-pt documentation

Fix intel-pt documentation to reflect the change of itrace defaults for
perf script.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 4eb06815 ("perf script: Make itrace script default to all calls")
Link: http://lkml.kernel.org/r/20190520113728.14389-4-adrian.hunter@intel.com


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