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This issue was detected by rpmdiff tool: iptables-utils RPM does not contain a man page for nfnl_osf utility. This is consistent with upstream, so one has to write one first.

Patches sent upstream: https://marc.info/?l=netfilter-devel&m=150592646409406&w=2
Series contains a fix to nfnl_osf help output as well, which also should be backported (so help output and man page stay consistent).

Upstream accepted my patches:

commit 1773dcaabb73884666d30b926677f8232e5c04b3
Author: Phil Sutter <phil>
Date:   Wed Sep 20 18:54:08 2017 +0200

    utils: nfnl_osf: Fix synopsis in help text
    
    * -d is optional
    * -h is not really a flag, just anything not recognized triggers the
      help output.
    * That '<del rules>' bit is rather confusing than helpful.
    
    Signed-off-by: Phil Sutter <phil>
    Signed-off-by: Pablo Neira Ayuso <pablo>

commit af468b6e7f35db09af10ae4ec65cc7803180a4b4
Author: Phil Sutter <phil>
Date:   Wed Sep 20 18:54:09 2017 +0200

    utils: Add a man page for nfnl_osf
    
    Signed-off-by: Phil Sutter <phil>
    Signed-off-by: Pablo Neira Ayuso <pablo>

Targeting RHEL7.6 for this one.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3093