changelog/10.9.0_2021-12-20/39026 from owncloud/core

changelog/10.9.0_2021-12-20/39026

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Enhancement: Add command to verify all available doc links

All available doc links can now be tested and verified via `make test-doc-links`. It is also possible to 
specify the ownCloud version to look for in the docs via `make test-doc-links DOC_LINK_VERSION=10.7`.
It defaults to the ownCloud version of the current installation.

https://github.com/owncloud/core/pull/39026
https://github.com/owncloud/enterprise/issues/4671