DOC: the default value of `engine` argument in `eval` should be `None`

[cmp0xff]

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

https://pandas.pydata.org/docs/dev/reference/api/pandas.eval.html

Documentation problem

In the docstring: engine :{'python', 'numexpr'}, default 'numexpr'
In the definition: engine: str | None = None,

Suggested fix for documentation

engine :{'python', 'numexpr'}, optional, default None

[zacharym-collins]

take

[zacharym-collins]

take

UPDATE: PR Submitted: #63382