Adds Java Doc

Author: AzureDoom

src/main/java/com/azuredoom/levelingcore/database/JdbcLevelRepository.java

@@ -345,6 +345,15 @@ public boolean exists(UUID id) {
         }
     }
 
+    /**
+     * Closes the underlying JDBC datasource if it implements {@link AutoCloseable}.
+     * <p>
+     * This method attempts to close the {@code dataSource} resource gracefully. If the {@code dataSource}
+     * is an instance of {@code AutoCloseable}, its {@code close()} method is invoked. Any exception
+     * raised during the closing process is caught and wrapped in a {@link LevelingCoreException}.
+     *
+     * @throws LevelingCoreException if an error occurs while closing the {@code dataSource}.
+     */
     @Override
     public void close() {
         try {