Fix the docstring of _import_toml() to match the code

[hroncok]

I've just noticed this and submitted this PR via the web editor.

[sesheta]

Hi @hroncok. Thanks for your PR.

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[sesheta]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: frenzymadness

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[harshad16]

/ok-to-test

[frenzymadness]

Cherry-picked to #262