Issue #3589771: BlockRepository::getVisibleBlocksPerRegion() should document that it's for the current theme

Avinash jharequested to merge
issue/drupal-3589771:3589771-blockrepositorygetvisibleblocksperregion-should-document into main

Issue #3589771: BlockRepository::getVisibleBlocksPerRegion() should document that it's for the current theme

Closes #3589771

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