tp: improve documentation for thread and process tables am: 97094f5dde am: 179a29af54 am: bb98bfbc9f
tp: improve documentation for thread and process tables am: 97094f5dde am: 179a29af54 am: bb98bfbc9f

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1881861

Change-Id: I88b0be7c574c306b8b0b9f0b3e0f77a25f8ec961

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