perf augmented_raw_syscalls: Fix up comment

Cut'n'paste error, the second comment is about the syscalls that have as
its second arg a string.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-zo5s6rloy42u41acsf6q3pvi@git.kernel.org


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