[firewalls] Notes about pf as a module

[Max Laier]

Hi,

as per a discussion on -stable and a IPF related PR (kern/70401) - I'd like to 
add a note about this problem in the PF documentation.  See attachted diff 
for details.  IPF (and IPFW???) might need similar, but that's not my field 
of expertise ;)

I'd be thankfull if you could pick this up, thanks in advance.

-- 
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