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I think the Papers section can be suitable. In the category description post it says:

 > Example of paper topics: [...] A survey of scattered information, with the paper putting it all in one place.

A self-answered question would also work well, I think, as such questions are also popular on the StackExchange sites and get a lot of attention.

As for the example datasheet, I would perhaps go for some widely used general-purpose op-amp. Op-amps are covered in EE education so most terms in the datasheet should at least be familiar. Using an op-amp should also be a good case study since you can hook it up in different ways and have different part of the datasheet matter more for a specific application. This way you can demonstrate how to quickly look for relevant information, which I think is the #1 skill for reading datasheets.