Commits on Dec 27, 2019

1. doc: improve dns introduction …

   The introductory paragraphs for the `dns` module do not explain what the
   module is for. Add a short (two brief sentences) explanation.
   
   It also emphasizes that functions in the dns module are
   divided into two categories, but that there is only one function in one
   of the categories, making the whole categories thing a bit odd to
   emphasize. Keep the material about the distinctions without discussing
   categories.
   
   There are other incidental revisions (changing an example IP to
   `example.org` and so on).
   
   PR-URL: nodejs#31090
   Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
   Reviewed-By: James M Snell <jasnell@gmail.com>
   Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
   Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

   

   Trott committed Dec 27, 2019
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