Update partition_table.rst with Variants folder detail, and new 3rd Party Board#8507

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James-4DSystems wants to merge 3 commits intoespressif:masterfrom

James-4DSystems:master

Commits on Aug 9, 2023

Update partition_table.rst
James-4DSystems
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Commits on Aug 10, 2023

Added 4D Systems gen4-ESP32 Boards
James-4DSystems
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Commits on Aug 14, 2023

Merge branch 'master' into master
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