Update pd-t7-3.md (issue #216)

Corrected the structure of the article and the description of the system.

link to issue #216 (closed)

changed title from Update pd-t7-3.md (issue #215) to Update pd-t7-3.md (issue #216)

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• 0b857aec - Update pd-t7-3.md

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• 8399b68d - Update pd-t7-3.md

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enabled an automatic merge when the pipeline for 8399b68d succeeds

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mentioned in commit 7cfcd391