docs: rework trace processor docs am: cb45a21340 am: 8aa752bec6 am: 48728bc394
docs: rework trace processor docs am: cb45a21340 am: 8aa752bec6
am: 48728bc394

Change-Id: I8c36688037b1893d6dcab6c8c05cc67e36599c6d

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto