Add a note on how to update the godocs snapshot.
Add a note on how to update the godocs snapshot.

Change-Id: I5ce392aa7316acdecf48b229802a21c024dc13f7
GitOrigin-RevId: 4bbb7d0b8319f11d64260e9050684b370ed2a9c3

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core