docs: fix correct Accelerator pipeline options in docs/examples/custom_convert.py

[Ighina]

fix[docs/examples/custom_convert.py]: Added the missing AcceleratorDevice and AcceleratorOptions functions in the imports and changed Device in the code to the correct AcceleratorDevice.

Checklist:

• [ x] Documentation has been updated, if necessary.
• [ x] Examples have been added, if necessary.
• [ x] Tests have been added, if necessary.

[mergify]

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[cau-git]

@Ighina Thanks for this fix. Could you please run the pre-commit toolchain to ensure the tests can pass?

1. Make sure you installed pre-commit, i.e. poetry run pre-commit install
2. Make a dummy commit with no changes to run the toolchain.

[vagenas]

FYI reported in #724.

[dolfim-ibm]

LGTM