[wp-trac] [WordPress Trac] #59768: Replace `tabindex` example in submit button function docs

[WordPress Trac]

#59768: Replace `tabindex` example in submit button function docs
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 Reporter:  sabernhardt               |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  6.5
Component:  Administration            |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  good-first-bug has-patch  |     Focuses:  accessibility, docs
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Comment (by benjaminknox):

 I chose to use the id attribute as an example, I think it is a pretty good
 example for the button considering it would be set by developers pretty
 often.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59768#comment:4>
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