8372055: Fragment link tag does not work in package info

[hns]

Please review a change to make unqualified anchor references such as {@link ##anchor link} work everywhere. Previously, such links only worked in class pages. The fix consists in attributing the correct Element in JavacTrees::attributeDocReference for references declared in API elements, and setting it to null for references defined in doc-files to make them work as local links.

Because of unattributed doc-files references, we also have to exclude such links from the reference check in DocLint. This is fine because local references always have a target element, and we do not check the anchor anyway.

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Issue

• JDK-8372055: Fragment link tag does not work in package info (Bug - P3)

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