message: Update commentary of PacingController
  Cr-Commit-Position: refs/heads/main@{#35334}
diff: @@ -38,9 +38,9 @@ namespace webrtc {
  // This class implements a leaky-bucket packet pacing algorithm. It handles the
  // logic of determining which packets to send when, but the actual timing of
  -// the processing is done externally (e.g. PacedSender). Furthermore, the
  +// the processing is done externally (e.g. RtpPacketPacer). Furthermore, the
  // forwarding of packets when they are ready to be sent is also handled
  -// externally, via the PacedSendingController::PacketSender interface.
  +// externally, via the PacingController::PacketSender interface.
  //
  class PacingController {
  public:
  