docs: update abstract document

abstract-document/README.md

@@ -77,7 +77,8 @@ public abstract class AbstractDocument implements Document {
                 .flatMap(Collection::stream)
                 .map(constructor);
     }
-  ...
+    
+    // Other properties and methods...
 }
 ```
 
@@ -132,6 +133,7 @@ public class Car extends AbstractDocument implements HasModel, HasPrice, HasPart
 And finally here's how we construct and use the `Car` in a full example.
 
 ```java
+  public static void main(String[] args) {
     LOGGER.info("Constructing parts and car");
 
     var wheelProperties = Map.of(
@@ -155,7 +157,12 @@ LOGGER.info("Here is our car:");
     LOGGER.info("-> model: {}", car.getModel().orElseThrow());
     LOGGER.info("-> price: {}", car.getPrice().orElseThrow());
     LOGGER.info("-> parts: ");
-car.getParts().forEach(p -> LOGGER.info("\t{}/{}/{}", p.getType().orElse(null), p.getModel().orElse(null), p.getPrice().orElse(null)));
+    car.getParts().forEach(p -> LOGGER.info("\t{}/{}/{}",
+            p.getType().orElse(null),
+            p.getModel().orElse(null),
+            p.getPrice().orElse(null))
+    );
+}
 ```
 
 The program output: