[JSPreflight] Updates to Spec

I have updated the spec regarding a couple of points:

  *   General clean up and fixing some inconsistencies based on comments
  *   New introduction pointing out the use cases clearer and also adding examples
  *   A first version of the processing model

You can find it at https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/JSPreflightInjection/Overview.html
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