[InterNetNews/inn] fe5902: Convert libinn_dbz(3) documentation to POD

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: fe5902a1537ec3c784d367bbc59a1969192e9f25
      https://github.com/InterNetNews/inn/commit/fe5902a1537ec3c784d367bbc59a1969192e9f25
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-02-08 (Tue, 08 Feb 2022)

  Changed paths:
    M MANIFEST
    R doc/man/libinn_dbz.3
    M doc/pod/Makefile
    A doc/pod/libinn_dbz.pod
    M include/inn/dbz.h
    M lib/dbz.c

  Log Message:
  -----------
  Convert libinn_dbz(3) documentation to POD

Document the new API.  Several functions have changed (dbzfetch, dbzstore):
arguments and return values are the same whether tagged hash format was
enabled or not.

Document .pag name, DBZSTORE_xxx values, the default values for
DBZ_INTERNAL_HASH_SIZE, nonblock only if not mmap'ing.

Fix the comment in the dbzfetch() function.