[wp-trac] [WordPress Trac] #32246: Fix a variety of phpDoc issues

[WordPress Trac]

#32246: Fix a variety of phpDoc issues
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 Reporter:  DrewAPicture    |      Owner:
     Type:  task (blessed)  |     Status:  new
 Priority:  low             |  Milestone:  4.3
Component:  General         |    Version:
 Severity:  normal          |   Keywords:  has-patch
  Focuses:  docs            |
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 * Add DocBlocks where missing
 * Clarify param/return types where applicable
 * Add missing `@since` versions

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Ticket URL: <https://core.trac.wordpress.org/ticket/32246>
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