Add isAutolink property to Link #110
                
     Merged
            
            
          
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Bug/issue #, if applicable:
With swiftlang/swift-docc#376
Close swiftlang/swift-docc#271
Summary
LinkAdd a setter toLink.isAutolinkso that after updating destination of link, we can preserve the old isAutolink value.See discussion on swiftlang/swift-docc#376 (comment)
Dependencies
None
Testing
swiftlang/swift#61506
Checklist
Make sure you check off the following items. If they cannot be completed, provide a reason.
./bin/testscript and it succeeded