Add link to documetnationAdd link to documentation

Author: koppor

jablib/src/main/java/org/jabref/logic/importer/fetcher/transformers/SpringerQueryTransformer.java

@@ -1,10 +1,11 @@
 package org.jabref.logic.importer.fetcher.transformers;
 
-/**
- * This class converts a query string written in lucene syntax into a complex  query.
- *
- * For simplicity this is currently limited to fielded data and the boolean AND operator.
- */
+/// This class converts a query string written in lucene syntax into a complex  query.
+///
+/// For simplicity this is currently limited to fielded data and the boolean AND operator.
+///
+/// See <https://dev.springernature.com/docs/supported-query-params/?source=data-solutions> for a complete list of supported fields.
+/// `handleUnFieldedTerm` is not overridden, because the API handles unfielded terms.
 public class SpringerQueryTransformer extends AbstractQueryTransformer {
 
     @Override