Content.for_page_layout

Parsed documentation:
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OTU_PAGE_LAYOUTS
      V
OTU_PAGE_LAYOUT_SECTIONS ^ .otu_page_layout_id v .topic_id
      V
    TOPICS
      V
   CONTENTS              v otu_id              ^ .topic_id
      ^
     OTU

Given an otu_page_layout id. find all the topics
For this otu_page_layout, find the topics (ControlledVocabularyTerm.of_type(:topic))
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