8366094: Sealed graph for nested types creates broken links

[hns]

Please review a change to fix broken links in sealed type hierarchy graphs for nested types. The problem is that enclosing types are included in the path of the graph file and therefore must have a matching ../ in the generated link.

Fixed graphs for some nested sealed types:

• ClassFile.Option
• Signature.RefTypeSig
• TypeAnnotation.TargetInfo

There is currently no test coverage for the sealed graph taglet. I tested the fix manually, a test should be added with JDK-8366828.

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Issue

• JDK-8366094: Sealed graph for nested types creates broken links (Bug - P4)

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