typo

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

go/vt/discovery/tablet_health_check.go

@@ -73,7 +73,7 @@ type tabletHealthCheck struct {
  // LastError is the error we last saw when trying to get the
  // tablet's healthcheck.
  LastError error
- // Timestamp is represents the time the healthcheck data was produced.
+ // Timestamp represents the time the healthcheck data was produced.
  Timestamp *vttime.Time
  // possibly delete both these
  loggedServingState bool