/usr/share/doc/libdynamic-reconfigure-config-init-mutex-dev/changelog.Debian.gz is in libdynamic-reconfigure-config-init-mutex-dev 1.5.49-1.
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It is a symlink to /usr/share/doc/libdynamic-reconfigure-config-init-mutex-dev/../libdynamic-reconfigure-config-init-mutex0d/changelog.Debian.gz