[wp-trac] [WordPress Trac] #41619: Fix documentation issues for `domain_exists()`

[WordPress Trac]

#41619: Fix documentation issues for `domain_exists()`
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 Reporter:  flixos90                  |       Owner:  stevenlinx
     Type:  defect (bug)              |      Status:  assigned
 Priority:  normal                    |   Milestone:  4.9
Component:  Networks and Sites        |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  good-first-bug has-patch  |     Focuses:  docs, multisite
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Comment (by flixos90):

 Changes look good @stevenlinx, thanks for continuing to work on it!

 @DrewAPicture You're good with this?

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Ticket URL: <https://core.trac.wordpress.org/ticket/41619#comment:5>
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