message: op-batcher: channelManager: Rename addBlocks -> processBlocks
  and improve other code docs. It was confusing that AddL2Block adds a
  block to the queue whereas addBlocks processed them, thereby removing
  them from the queue. So renamed to `processBlocks`.
diff: @@ -213,7 +213,7 @@ func (s *channelManager) TxData(l1Head eth.L1BlockRef) ([]byte, txID, error) {
  s.triggerTimeout(l1Head)
  - if err := s.addBlocks(); err != nil {
  + if err := s.processBlocks(); err != nil {
  return nil, txID{}, err
  }
  @@ -249,9 +249,9 @@ func (s *channelManager) triggerTimeout(l1Head eth.L1BlockRef) {
  )
  }
  -// addBlocks adds blocks from the blocks queue to the pending channel until
  +// processBlocks adds blocks from the blocks queue to the pending channel until
  // either the queue got exhausted or the channel is full.
  -func (s *channelManager) addBlocks() error {
  +func (s *channelManager) processBlocks() error {
  var blocksAdded int
  var _chFullErr *ChannelFullError // throw away, just for type checking
  for i, block := range s.blocks {
  @@ -284,9 +284,9 @@ func (s *channelManager) addBlocks() error {
  return nil
  }
  -// AddL2Block saves an L2 block to the internal state. It returns ErrReorg
  -// if the block does not extend the last block loaded into the state.
  -// If no blocks were added yet, the parent hash check is skipped.
  +// AddL2Block adds an L2 block to the internal blocks queue. It returns ErrReorg
  +// if the block does not extend the last block loaded into the state. If no
  +// blocks were added yet, the parent hash check is skipped.
  func (s *channelManager) AddL2Block(block *types.Block) error {
  if s.tip != (common.Hash{}) && s.tip != block.ParentHash() {
  return ErrReorg
  