perf annotate stdio2: Print more descriptive event information header

To match the recently added event header information to --tui, e.g.:

  # perf annotate --ignore-vmlinux --stdio2 _raw_spin_lock_irqsave
  Samples: 128  of event 'cycles:ppp', 4000 Hz, Event count (approx.): 48617682
  _raw_spin_lock_irqsave() /proc/kcore
    0.78        nop
    7.03        push   %rbx
    3.12        pushfq
    6.25        pop    %rax
                nop
                mov    %rax,%rbx
    3.12        cli
                nop
                xor    %eax,%eax
                mov    $0x1,%edx
   79.69        lock   cmpxchg %edx,(%rdi)
                test   %eax,%eax
              ↓ jne    2b
                mov    %rbx,%rax
                pop    %rbx
              ← retq
          2b:   mov    %eax,%esi
              → callq  *ffffffffb30eaed0
                mov    %rbx,%rax
                pop    %rbx
              ← retq
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-ujy46x7cldyhyxelyf2b9quy@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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