RFR: 8366094: Sealed graph for nested types creates broken links [v3]

[Hannes Wallnöfer]

> Please review a change to fix broken links in sealed type hierarchy graphs for nested types. The problem is that SVG files for nested types use the names of enclosing types as parent directories. Therefore, links from nested type SVGs  must have a matching `../` for each enclosing type. 
> 
> Fixed graphs for some nested sealed types: 
>  - [ClassFile.Option](https://cr.openjdk.org/~hannesw/8366094/api.00/java.base/java/lang/classfile/ClassFile.Option.html)
>  - [Signature.RefTypeSig](https://cr.openjdk.org/~hannesw/8366094/api.00/java.base/java/lang/classfile/Signature.RefTypeSig.html)
>  - [TypeAnnotation.TargetInfo](https://cr.openjdk.org/~hannesw/8366094/api.00/java.base/java/lang/classfile/TypeAnnotation.TargetInfo.html)
> 
> There is currently no test coverage for the sealed graph taglet. I tested the fix manually, a test should be added with [JDK-8366828](https://bugs.openjdk.org/browse/JDK-8366828).

Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:

  Add comment to explain SVG naming scheme

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28134/files
  - new: https://git.openjdk.org/jdk/pull/28134/files/eb3c1ec3..ef36422e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28134&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28134&range=01-02

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28134.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28134/head:pull/28134

PR: https://git.openjdk.org/jdk/pull/28134