[wp-trac] [WordPress Trac] #35453: Document what installation mode is in inline docs

[WordPress Trac]

#35453: Document what installation mode is in inline docs
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 Reporter:  ericlewis        |      Owner:
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Upgrade/Install  |    Version:  3.0
 Severity:  normal           |   Keywords:
  Focuses:  docs             |
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 Boone had a good description of installation mode in r34828.

 Let's bring this in somewhere useful in inline documentation, as its
 functionality is not immediately clear without some back story.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35453>
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