Lintian tag information: debian-changelog-file-is-a-symlink (type: warning)

Description (from lintian-explain-tags)

The Debian changelog file is a symlink to a file in a different directory
or not found in this package. Please don't do this. It makes package
checking and manipulation unnecessarily difficult. Because it was a
symlink, the Debian changelog file was not checked for other problems.
(Symlinks to another file in /usr/share/doc/*pkg* or a subdirectory
thereof are fine and should not trigger this warning.)

To refer to the changelog, copyright, and other documentation files of
another package that this one depends on, please symlink the entire
/usr/share/doc/*pkg* directory rather than individual files.

Visibility: warning
Show-Always: no
Check: debian/changelog

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