doc: libnftables-json: Review asciidoc syntax

This changes asciidoc markup according to a few best practices
recommended in [1] and a quick review of html output:

* Use atx-style headings everywhere apart from the document title.
  This requires to explicitly disable compat-mode after the latter.

* Use only the minimum number of dashes for listings.

* Enclose verses with empty lines in a verse block instead of having
  multiple verses for it.

* Indent continued lines in synopsis for added readability.

[1] https://asciidoctor.org/docs/asciidoc-recommended-practices/

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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