doc: Document derivability changes

11 jobs for final in 20 minutes and 55 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed api-visibility #811698

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passed build-debian-clang #811700

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passed build-debian-gcc #811699

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passed build-fedora-gcc #811701

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passed build-flatpak #811702
flatpak

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passed build-flatpak-glade #811703
flatpak

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  Test+Docs
passed build-gtkdoc #811704

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passed unit-test #811705

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44.3%
 
  Package
passed package-debian-buster #811706

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  Test Package
passed autopkgtest-debian-buster-package #811707

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passed lintian-debian-buster-package #811708

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