Update code sample when importing modules in queue doc (GH-94244) (GH-94490)

In the queue documentation, the code snippet shows the import to be not PEP 8 compliant.

Since people typically copy-paste from such code samples, I think it's important to show best-practices here.
(cherry picked from commit ad55147c1d5dbfc23d2ec4554f5e82c18984158c)

Co-authored-by: Mariatta Wijaya <Mariatta@users.noreply.github.com>