DOC[?]: Example for ts regression with overloaded .shift

[jona-sassenhagen]

Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

(n/a)

Documentation problem

Following up on #54115, I wanted to propose adding an example like the following somewhere to the docs/cookbook/..., if you think it would make sense.
If you don't think anything like this makes sense, fine too.

Suggested fix for documentation

https://gist.github.com/jona-sassenhagen/03ede1e1e344744b6692e7dae15a3706