[Chicken-janitors] #934: improve documentation for functors and named interfaces

[Chicken Trac]

#934: improve documentation for functors and named interfaces
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 Reporter:  felix              |       Owner:         
     Type:  defect             |      Status:  new    
 Priority:  minor              |   Milestone:  someday
Component:  documentation      |     Version:  4.8.x  
 Keywords:  functor interface  |  
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 The documentation for functors and interfaces (as defined by `define-
 interface`) needs to be expanded and improved, and examples added.

 (Suggested by Matt Gushee)

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Ticket URL: <http://bugs.call-cc.org/ticket/934>
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