doc: improve dns introduction#31090
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The introductory paragraphs for the
dnsmodule do not explain what themodule 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.organd so on).Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes