There is a Documentation page about Advance Export. But it is incomplete for now.
The chapters about the Video, Codec and Audio tabs are blank.
I hope someday someone with a good knowledge of all these parameters will fill those blank 
When it is done, maybe a link to the Documentation page could be added somewhere at the bottom of the Export panel when on Advance mode. There are links included with some of the filters. The Compressor audio filter for example.
A tooltip is a good idea. In fact, I believe that all the parameters in the Export panel should have easy to understand tooltips.
But they will anyway
And when you think of it, it’s not such a bad thing. How can anyone become an advanced user if he/she never plays with the advanced stuff? Good tooltips + a link to a complete documentation will help them improve their skills faster.