docs: improve formatting and clarity in Factory Method pattern documentation

Author: AdelDaniel

creational_design_pattern/factory_method/README.md

@@ -1,39 +1,42 @@
 # Factory Method Pattern
+
 Also known as: `Virtual Constructor`
 
     - is a creational pattern.
     - uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created.
 
     This is done by creating objects by calling a factory method—either specified in an interface and implemented by child classes, or implemented in a base class and optionally overridden by derived classes—rather than by calling a constructor.
 
-
-
 ## Sections
 
 - [Examples](#Examples)
-    - [shape Example](#shape-Example)
-    - [Dialog Example](#Dialog-Example)
-    - [vessel volume Example](#vessel-volume-Example)
+  - [shape Example](#shape-Example)
+  - [Dialog Example](#Dialog-Example)
+  - [vessel volume Example](#vessel-volume-Example)
 - [Resources](#Resources)
 
 ## Examples
 
 ### shape Example
+
 source: [Tutorial Point java ](https://www.tutorialspoint.com/design_pattern/factory_pattern.htm)
 <img src="assets/factory_pattern_uml_diagram.jpg" >
 
-
 #### Step 1
- Create an interface.
+
+Create an interface.
 
 ```dart
 abstract class IShape {
   const IShape();
   void draw();
 }
 ```
+
 #### Step 2
- Create concrete classes implementing the same interface.
+
+Create concrete classes implementing the same interface.
+
 ```dart
 class Rectangle implements IShape {
   @override
@@ -50,8 +53,11 @@ class Circle implements IShape {
   void draw() => print("Inside Circle::draw() method.");
 }
 ```
+
 #### Step 3
- Create a Factory to generate object of concrete class based on given information.
+
+Create a Factory to generate object of concrete class based on given information.
+
 ```dart
 enum ShapeType { CIRCLE, RECTANGLE, SQUARE }
 
@@ -73,6 +79,7 @@ class ShapeFactory {
 ```
 
 #### Step 4
+
 Use the Factory to get object of concrete class by passing an information such as type.
 
 ```dart
@@ -94,14 +101,17 @@ void main() {
 ```
 
 ---
+
 ### Dialog Example
+
     This example illustrates how the Factory Method can be used for creating cross-platform UI elements without coupling the client code to concrete UI classes.
 
 - <strong><a href="dialog_example" target="_blank"> Dialog Example</a></strong>
 
-
 ---
+
 ### vessel volume Example
+
 source: [Design Pattern in Dart ( factory method ) ](https://github.com/scottt2/design-patterns-in-dart/tree/master/factor_method)
 
 `updated code in coffee_example.dart`
@@ -164,8 +174,8 @@ void main() {
 }
 ```
 
+## Resources
 
-## Resources 
- - [Wikipedia: Factory Method](https://en.wikipedia.org/wiki/Factory_method_pattern)
+- [Wikipedia: Factory Method](https://en.wikipedia.org/wiki/Factory_method_pattern)
 
- - [Design Pattern in Dart ( factory method ) ](https://github.com/scottt2/design-patterns-in-dart/tree/master/factor_method)
+- [Design Pattern in Dart (factory method) ](https://github.com/scottt2/design-patterns-in-dart/tree/master/factor_method)