rec: document that forwarding catalog zones cannot be combined with Lua config.

[omoerbeek]

…ua config.

Fixes #15052

Short description

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)
• checked that this code was merged to master

[coveralls]

Pull Request Test Coverage Report for Build 12890483737

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 60 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.007%) to 64.69%

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Files with Coverage Reduction	New Missed Lines	%
pdns/recursordist/syncres.cc	1	80.05%
pdns/backends/gsql/gsqlbackend.hh	1	97.71%
pdns/recursordist/sortlist.cc	2	74.12%
pdns/remote_logger.cc	3	53.36%
pdns/signingpipe.cc	5	83.91%
pdns/dnsdistdist/dnsdist-carbon.cc	9	62.67%
ext/json11/json11.cpp	12	62.72%
pdns/recursordist/test-syncres_cc1.cc	13	89.37%
modules/lmdbbackend/lmdbbackend.cc	14	72.79%

Totals
Change from base Build 12884379895:	-0.007%
Covered Lines:	127781
Relevant Lines:	166434

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💛 - Coveralls