In https://interactivebrokers.github.io/tws-api/ it shows "TWS API v9.72+". However the API version is already 10.11. Is there newer version of the documentation?
That means it applies to TWS versions 9.72 and on. They don't generally change the API for obvious reasons.
IB does not make documentation for each API version. They appear to consider their API documentation a "living document" and update it whenever they release a new API version.