docs: fix export-dynamic-plugin command for exporting backend plugins

[zeshanziya]

Description

Please explain the changes you made here.

Which issue(s) does this PR fix

• Fixes #?

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• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
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[openshift-ci]

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[openshift-ci]

Hi @zeshanziya. Thanks for your PR.

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