The tool parses out the bits that you're interested in. If you want to know what year the proverbial apple fell on Isaac Newton's head, you can get a biography

The tool parses out the bits that you're interested in. If you want to know what year the proverbial apple fell on Isaac Newton's head, you can get a biography and start reading, or you can Google and let the machine filter out the irrelevant bits. If I'm looking at documentation, I want the inputs and outputs and a brief description of what it does. I care very little about the implementation, or I would write my own.