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This extends the build performance guide in the Cargo book with the parallel frontend. This is the first mechanism we have in the guide that is not configured via profiles (unless we want to advertise setting `rustflags` through profiles?), but rather through `RUSTFLAGS`. Which means that we have to explain how to do that. I proposed using footnotes for this, so that we can reuse them also for other thing (such as explaining how to change a profile). An alternative would be to have a short paragraph at the beginning of the configuration subsection where we explain all the possible ways of configuring things, and then we refer to them. This is a follow up to #15924 r? @epage