Lintian tag information: license-problem-gfdl-invariants-empty (type: information)

Description (from lintian-explain-tags)

The given source file is licensed under GFDL, but without any precision
about the presence of invariant sections, front-cover or back-cover text.

GFDL license explicitly requests you to document this non-presence.

Please refer to https://wiki.debian.org/qa.debian.org/gfdlinvariant and
https://www.debian.org/vote/2006/vote_001 for details.

Visibility: info
Show-Always: no
Check: cruft

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