Describe the bug, including details regarding any error messages, version, and platform.

In the Arrow documentation one could use the "Show source" link to check the source of the documentation or even more important the source code in the API docs. This doesn't work currently as it links to a 404 No found page.

https://arrow.apache.org/docs/dev/cpp/api/datatype.html --> https://arrow.apache.org/docs/dev/_sources/cpp/api/datatype.rst.txt

Component(s)

Documentation