Pre-bedrock protocol specs need to be updated throughout the docs

[sbvegan]

We have identified at least one instance of old protocol specs found in the documentation, we need to go through and make sure everything is consistent with post bedrock.

The instance: https://community.optimism.io/docs/developers/bridge/messaging/#for-l1-%E2%87%92-l2-transactions
It mentions the old CTC contract, but this is now a batcher EOA.

There may be more.