[wp-trac] [WordPress Trac] #58481: Mark `apply_filters()` third parameter as optional

[WordPress Trac]

#58481: Mark `apply_filters()` third parameter as optional
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 Reporter:  audrasjb      |      Owner:  audrasjb
     Type:  defect (bug)  |     Status:  assigned
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 The `$args` parameter of `apply_filters()` is optional. We should update
 the related Docblock description accordingly so the parameter is not
 indicated as `required` on DevHub.

 See https://developer.wordpress.org/reference/functions/apply_filters/

 Props @gilles66 for pointing this out in a DevHub comment.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58481>
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