Update README a bit.

Author: runemalm

README.md

@@ -29,7 +29,7 @@ $ pip install py-dependency-injection
 
 The following examples demonstrates how to use the library.
 
-#### Example: Obtaining the Default Dependency Container
+### Example: Obtaining the Default Dependency Container
 
 ```python
 # Retrieve the default container, typically recommended for a single-application setup.
@@ -40,7 +40,7 @@ from dependency_injection.container import DependencyContainer
 dependency_container = DependencyContainer.get_instance()
 ```
 
-#### Example: Obtaining a Second Dependency Container
+### Example: Obtaining a Second Dependency Container
 
 ```python
 # Create additional containers if needed, especially for multi-application scenarios.
@@ -51,7 +51,7 @@ from dependency_injection.container import DependencyContainer
 a_second_dependency_container = DependencyContainer.get_instance(name="a_second_dependency_container")
 ```
 
-#### Example: Registering Dependencies
+### Example: Registering Dependencies
 
 ```python
 # Register dependencies with three available scopes: transient, scoped, or singleton.
@@ -61,7 +61,7 @@ dependency_container.register_scoped(AnotherInterface, AnotherClass)
 dependency_container.register_singleton(ThirdInterface, ThirdClass)
 ```
 
-#### Example: Resolving Dependencies
+### Example: Resolving Dependencies
 
 ```python
 # Resolve transient instance (created anew for each call).
@@ -74,7 +74,7 @@ scoped_instance = dependency_container.resolve(AnotherInterface, scope_name="app
 singleton_instance = dependency_container.resolve(ThirdInterface)
 ```
 
-#### Example: Constructor Injection
+### Example: Constructor Injection
 
 ```python
 # Class instances resolved through the container have dependencies injected into their constructors.
@@ -87,7 +87,7 @@ class Foo:
         self._singleton_instance = singleton_instance
 ```
 
-#### Example: Method Injection
+### Example: Method Injection
 
 ```python
 # Inject dependencies into instance methods using the `@inject` decorator.