[wp-trac] [WordPress Trac] #45203: Document all optional parameters as optional in add_image_size()

[WordPress Trac]

#45203: Document all optional parameters as optional in add_image_size()
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 Reporter:  DrewAPicture    |       Owner:  (none)
     Type:  defect (bug)    |      Status:  new
 Priority:  normal          |   Milestone:  Future Release
Component:  Media           |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  good-first-bug  |     Focuses:  docs
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Changes (by andrewza):

 * Attachment "#45203.1.diff" added.

 Updated doc block further to include what the variables default to.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45203>
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