message: Fix function description for CreateTPUBridgePipeline (NFC).
  The last description line was accidentally removed when the v1 pipeline was added.
diff: @@ -337,6 +337,7 @@ std::unique_ptr<OperationPass<ModuleOp>>
  CreateTPUExtractOutsideCompilationPass();
  // Populates the supplied passmanager with the passes required to run the
  +// bridge.
  void CreateTPUBridgePipeline(OpPassManager& pm);
  // Populates the supplied passmanager with the passes required to run the
  