Try to improve freshness-check description

[klaus-nicat]

Short description

Try to improve freshness-check 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)

[coveralls]

Pull Request Test Coverage Report for Build 12087511287

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 55 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.002%) to 64.692%

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Files with Coverage Reduction	New Missed Lines	%
pdns/pollmplexer.cc	1	83.66%
pdns/recursordist/aggressive_nsec.cc	2	66.32%
pdns/sstuff.hh	2	56.83%
pdns/ws-auth.cc	2	80.8%
pdns/recursordist/test-syncres_cc2.cc	3	88.91%
pdns/stubresolver.cc	3	77.58%
pdns/recursordist/recpacketcache.hh	3	89.55%
modules/gpgsqlbackend/spgsql.cc	3	68.18%
pdns/packethandler.cc	4	72.35%
pdns/recursordist/syncres.cc	6	79.33%

Totals
Change from base Build 12087438521:	-0.002%
Covered Lines:	125837
Relevant Lines:	163644

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💛 - Coveralls