/usr/lib/monodoc/sources/Newtonsoft.Json.source is in monodoc-newtonsoft-json-manual 5.0r6+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<monodoc>
<node label="Newtonsoft.Json" name="Newtonsoft.Json" parent="libraries" />
<source provider="ecma" basefile="Newtonsoft.Json" path="Newtonsoft.Json" />
</monodoc>
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