logtail/backoff: update Backoff.BackOff docs (#12229)

Update #cleanup

Signed-off-by: Jordan Whited <jordan@tailscale.com>

logtail/backoff/backoff.go

@@ -44,9 +44,8 @@ func NewBackoff(name string, logf logger.Logf, maxBackoff time.Duration) *Backof
 	}
 }
 
-// Backoff sleeps an increasing amount of time if err is non-nil.
-// and the context is not a
-// It resets the backoff schedule once err is nil.
+// BackOff sleeps an increasing amount of time if err is non-nil while the
+// context is active. It resets the backoff schedule once err is nil.
 func (b *Backoff) BackOff(ctx context.Context, err error) {
 	if err == nil {
 		// No error. Reset number of consecutive failures.