fix to description of usage of public partitions

[cahlheim]

Description

This PR fixes the description of how to use public partititions. The code has been updated to pass public_partitions to dp_enging.aggregate, but the description still referred to the Params class.

Affected Dependencies

List any dependencies that are required for this change.

How has this been tested?

• no test required, only markdown change.

Checklist

• [ ] I have followed the Contribution Guidelines and Code of Conduct
• [ ] I have commented my code following the OpenMined Styleguide
• [ ] I have labeled this PR with the relevant Type labels
• [ ] My changes are covered by tests

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