fix typo - encapsulates (#3354)

Sources/ComposableArchitecture/Documentation.docc/Tutorials/MeetTheComposableArchitecture/01-Essentials/04-ComposingFeatures/01-04-ComposingFeatures.tutorial

@@ -178,7 +178,7 @@
 
  @Section(title: "Deriving child stores") {
  @ContentAndMedia {
- Now that we have a single composed `AppFeature` that encpasulates all of the logic and 
+ Now that we have a single composed `AppFeature` that encapsulates all of the logic and 
  behavior of the root app and its tabs, we can properly implement the view layer of the 
  application.
  }