Update execution-context.md

When we say **type** usually it means typescript type. In this case it will be a **class** itself returned so such naming is more understandable.

content/fundamentals/execution-context.md

@@ -117,7 +117,7 @@ export interface ExecutionContext extends ArgumentsHost {
 }
 ```
 
-The `getHandler()` method returns a reference to the handler about to be invoked. The `getClass()` method returns the type of the `Controller` class which this particular handler belongs to. For example, in an HTTP context, if the currently processed request is a `POST` request, bound to the `create()` method on the `CatsController`, `getHandler()` returns a reference to the `create()` method and `getClass()` returns the `CatsController` **type** (not instance).
+The `getHandler()` method returns a reference to the handler about to be invoked. The `getClass()` method returns the type of the `Controller` class which this particular handler belongs to. For example, in an HTTP context, if the currently processed request is a `POST` request, bound to the `create()` method on the `CatsController`, `getHandler()` returns a reference to the `create()` method and `getClass()` returns the `CatsController` **class** (not instance).
 
 ```typescript
 const methodKey = ctx.getHandler().name; // "create"