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Refresh module-level docs for `rustc_target::spec` We have long since gone on a curveball from the flexible-target-specification RFC by introducing stability and soundness promises to the language and compiler which we often struggle with extending to target-specific implementation details. Indeed, we often *literally cannot*. We also have modified the search algorithm details. Update the comments for `rustc_target::spec` considerably.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.