doc: Document the API changes

11 jobs for header-focus in 17 minutes and 15 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed api-visibility #805518

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passed build-debian-clang #805520

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passed build-debian-gcc #805519

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passed build-fedora-gcc #805521

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passed build-flatpak #805522
flatpak

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passed build-flatpak-glade #805523
flatpak

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  Test+Docs
passed build-gtkdoc #805524

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passed unit-test #805525

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44.6%
 
  Package
passed package-debian-buster #805526

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  Test Package
passed autopkgtest-debian-buster-package #805527

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passed lintian-debian-buster-package #805528

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