gh-118633: Add warning regarding the unsafe usage of eval and exec (GH-118437)

* Add warning regarding the unsafe usage of eval

* Add warning regarding the unsafe usage of exec

* Move warning under parameters table

* Use suggested shorter text

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* Use suggested shorter text

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* Improve wording as suggested

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Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>