Recently I had lost internet and had work that needed to be done. I ended up having to go to a coffee shop because I knew the name of a few functions I wanted to use but I didn't remember the calling semantics. I could have just tried it until it worked but I just took the excuse to go to Dunkin Donuts, grab a coffee, and work there.
Do they plan to release their Stack Overflow Documentation files? It would be a good way to start something like this. Make an offline and searchable version of this dataset with a uniform offline and searchable version of Python, Java, etc docs.