SubmitHandler not optional, and onSubmitCustomKeyboard is renamed

Sources/CustomKeyboardKit/CustomKeyboardBuilder.swift

@@ -11,7 +11,7 @@ import SwiftUI
 
 ///`CustomKeyboardBuilder` lets you build a custom keyboard in SwiftUI, together with haptic/audible feedback and callback on a "submit" button if provided in your layout
 ///- `UITextDocumentProxy` provides you the capability to modify the text thats in focus (e.g. inserting characters or strings, deleting backwards etc.),
-///- `SubmitHandler?` closure parameter is a closure, when called triggers the registered closure (using the `.onSubmitCustomKeyboard(:)` modifier.
+///- `SubmitHandler` closure parameter is a closure, when called triggers the registered closure (using the `.onCustomSubmit(action:)` modifier.
 ///- `SystemFeedbackHandler?` closure parameter is a closure, when called will play the keyboard system sounds and haptic feedback if enabled in the settings by the user
 public class CustomKeyboardBuilder: CustomKeyboard {
     public init(@ViewBuilder customKeyboardView: @escaping ((UITextDocumentProxy, @escaping SubmitHandler, SystemFeedbackHandler?) -> some View)) {