I didn’t intend being rude, tambourine, just a little light hearted whilst trying to demonstrate that the information you provided was a little misleading, particularly in relation to this question.
As it happens, geek that I am, I have the full Underground and DLR map (all lines, all stations) and most of the interchange details (whether they are long, short, involve stairs, where to be on the train to arrive nearest the exit, etc.) firmly fixed in my head. This comes from a lifetime of travelling around London and the suburbs for five days of most weeks.
If you need a map (and I do not believe that it would have added anything to the answers to this question that have been provided so far) the best place to get the most up to date version is from the Transport for London website.