[RTEMS Project] #2856: Improve the SPI framework documentation

[RTEMS trac]

#2856: Improve the SPI framework documentation
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 Reporter:  sebastian.huber  |      Owner:
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  5.0
Component:  Documentation    |    Version:  4.12
 Severity:  normal           |   Keywords:
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 The SPI framework documentation is quite rudimentary.

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Ticket URL: <http://devel.rtems.org/ticket/2856>
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