Commits on Aug 21, 2017

1. Don't print capabilities for type params when generating docs …

   Per
   #2145 (comment),
   this shouldn't be allowed as its not legal Pony. As #2145 generally
   comments on we only want legal code output in the documentation.
   
   This addresses the specific issue in #2145, however, there are other
   instances we might want to expand this to. I decided to limit to this
   specifically as I think any change we make in other sections of docgen
   would require a thorough auditing of output documentation to make sure
   there weren't any unintended consquences.
   
   Prior to this change, generated documentation for:
   
   ```pony
   type Set[A: (Hashable #read & Equatable[A] #read)] is HashSet[A,
   HashEq[A]]
   ```
   
   would be
   
   ```pony
   type Set[A: (Hashable #read & Equatable[A #read] #read)] is
     HashSet[A #read, HashEq[A #read] val] ref
   ```
   
   now it is
   
   ```
   type Set[A: (Hashable #read & Equatable[A] #read)] is
     HashSet[A, HashEq[A] val] ref
   ```

   

   SeanTAllen committed Aug 21, 2017
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