fix docs

[joamatab]

Summary by Sourcery

Documentation:

• Remove references to 'mpb' from the API design documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes references to 'mpb' from the documentation file api_design.rst. The changes appear to be minimal documentation updates.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removal of 'mpb' references from API design documentation	Removed 'mpb' references from the documentation	docs/api_design.rst

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