Fix Trag-bot review issues

- Removed trivial comments
- Fixed CHANGELOG.md

Author: alexsukhin

CHANGELOG.md

@@ -92,7 +92,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We improved the event viewer for debugging [#13783](https://github.com/JabRef/jabref/pull/13783).
 - We improved "REDACTED" replacement of API key value in web fetcher search URL [#13796](https://github.com/JabRef/jabref/issues/13796)
 - When the pin "Keep dialog always on top" in the global search dialog is selected, the search window stays open when double-clicking on an entry. [#13840](https://github.com/JabRef/jabref/issues/13840)
-- We separated the "Clean up entries" dialog into three tabs for clarity [13819](https://github.com/JabRef/jabref/issues/13819)
+- We separated the "Clean up entries" dialog into three tabs for clarity [#13819](https://github.com/JabRef/jabref/issues/13819)
 
 ### Fixed
 

jabgui/src/main/java/org/jabref/gui/cleanup/CleanupDialog.java

@@ -38,6 +38,11 @@ public CleanupDialog(BibDatabaseContext databaseContext, CleanupPreferences init
             if (button.getButtonData() == ButtonBar.ButtonData.OK_DONE) {
                 Tab selectedTab = tabPane.getSelectionModel().getSelectedItem();
                 CleanupPanel panel = (CleanupPanel) selectedTab.getContent();
+                /*
+                 * Returning null here is intentional: indicates either user cancelled
+                 * the dialog or panel had no preferences selected. Dialog.showAndWait()
+                 * will return Optional.empty() if null.
+                 */
                 return panel.getCleanupPreferences().orElse(null);
             } else {
                 return null;

jabgui/src/main/java/org/jabref/gui/cleanup/CleanupFileRelatedPanel.java

@@ -46,7 +46,6 @@ private void init(BibDatabaseContext databaseContext, CleanupPreferences cleanup
         } else {
             cleanUpMovePdf.setText(Localization.lang("Move linked files to default file directory %0", "..."));
 
-            // Since the directory does not exist, we cannot move it to there. So, this option is not checked - regardless of the presets stored in the preferences.
             cleanUpMovePdf.setDisable(true);
             cleanUpMovePdf.setSelected(false);
         }

jablib/src/main/java/org/jabref/logic/cleanup/CleanupPreferences.java

@@ -73,11 +73,6 @@ public void setFieldFormatterCleanups(FieldFormatterCleanups fieldFormatters) {
         fieldFormatterCleanups.setValue(fieldFormatters);
     }
 
-    /*
-     * Categories are used to group CleanupSteps by tab type. This allows the updateWith()
-     * method to replace only the steps of the same category when merging preferences from
-     * a single tab, without affecting other categories.
-     */
     public CleanupPreferences updateWith(CleanupPreferences tabPreferences) {
         EnumSet<CleanupStep> mergedJobs = getActiveJobs();