Change JavaDoc to annotation (JabRef#10571)

* Change JavaDoc to annoation (and fix visibility)

* Fix visibility

Author: koppor

src/main/java/org/jabref/logic/citationkeypattern/CitationKeyPatternPreferences.java

@@ -8,6 +8,8 @@
 import javafx.beans.property.SimpleStringProperty;
 import javafx.beans.property.StringProperty;
 
+import com.google.common.annotations.VisibleForTesting;
+
 public class CitationKeyPatternPreferences {
 
     public enum KeySuffix {
@@ -51,9 +53,7 @@ public CitationKeyPatternPreferences(boolean shouldAvoidOverwriteCiteKey,
         this.keywordDelimiter = keywordDelimiter;
     }
 
-    /**
-     * For use in test
-     */
+    @VisibleForTesting
     public CitationKeyPatternPreferences(boolean shouldAvoidOverwriteCiteKey,
                                          boolean shouldWarnBeforeOverwriteCiteKey,
                                          boolean shouldGenerateCiteKeysBeforeSaving,