Update pd-lambda-3.md (issue #215)

Updated the structure of the page, and the description of the system.

requested review from @ftesson

added 1 commit

• fd595513 - Update pd-lambda-3.md

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added 1 commit

• 17590668 - Update pd-lambda-3.md

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enabled an automatic merge when the pipeline for 17590668 succeeds

merged

mentioned in commit 624476d9