[wp-trac] [WordPress Trac] #59619: Remove discouraged `@return void` annotations

[WordPress Trac]

#59619: Remove discouraged `@return void` annotations
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 Reporter:  flixos90      |      Owner:  flixos90
     Type:  defect (bug)  |     Status:  assigned
 Priority:  normal        |  Milestone:  6.4
Component:  General       |    Version:
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:  docs          |
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 See https://developer.wordpress.org/coding-standards/inline-documentation-
 standards/php/#:~:text=Note%3A%20%40return%20void%20should%20not%20be%20used%20outside%20of%20the%20default%20bundled%20themes.

 > Note: `@return void` should not be used outside of the default bundled
 themes.

 There were a few PHP instances of `@return void` added in 6.4, and other
 recent releases and thus violate that guideline.

 Let's fix this throughout, except for themes (per the above), third-party
 libraries, and PHP compatibility code.

 Also see relevant Gutenberg change for reference:
 https://github.com/WordPress/gutenberg/pull/55237

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Ticket URL: <https://core.trac.wordpress.org/ticket/59619>
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