Update kotlin.md

Typo: module by moduel

docs/quickstart/kotlin.md

@@ -146,7 +146,7 @@ The `modules()` function in `startKoin` load the given list of modules
 
 ## Koin module: classic or constructor DSL?
 
-Here is the Koin moduel declaration for our app:
+Here is the Koin module declaration for our app:
 
 ```kotlin
 val appModule = module {