Problem with Javadoc multi-mappings

[tsantalis]

In PR JabRef/jabref-koppor#716
LinkedFilesConstants.java

RMiner generates 15 pairs of doc elements

However, the diff shows only 3 pairs

[tsantalis]

@pouryafard75
I think the problem is in the screenshot below.
For enum constants there is an early return that does not allow to execute JavaDocMatcher

[tsantalis]

I found another instance of the same problem in
jablib/src/main/java/org/jabref/logic/cleanup/CleanupPreferences.java