Replace Effect<Action> by Effect<Action, Never> in documentation (#1476)

(cherry picked from commit e4b3cfaf1fa243853a15cbe1fda16843ca10a037)

# Conflicts:
#	Sources/Dependencies/Dependencies/MainQueue.swift
#	Sources/Dependencies/Dependencies/MainRunLoop.swift

Author: tgrapperon

Sources/Dependencies/Dependencies/MainQueue.swift

@@ -26,7 +26,7 @@ extension DependencyValues {
   ///
   ///   @Dependency(\.mainQueue) var mainQueue
   ///
-  ///   func reduce(into state: inout State, action: Action) -> Effect<Action> {
+  ///   func reduce(into state: inout State, action: Action) -> Effect<Action, Never> {
   ///     switch action {
   ///     case .task:
   ///       return .run { send in

Sources/Dependencies/Dependencies/RandomNumberGenerator.swift

@@ -26,7 +26,7 @@ extension DependencyValues {
   ///
   ///   @Dependency(\.withRandomNumberGenerator) var withRandomNumberGenerator
   ///
-  ///   func reduce(into state: inout State, action: Action) -> Effect<Action> {
+  ///   func reduce(into state: inout State, action: Action) -> Effect<Action, Never> {
   ///     switch action {
   ///     case .rollDice:
   ///       self.withRandomNumberGenerator { generator in

Sources/Dependencies/Dependencies/UUID.swift

@@ -30,7 +30,7 @@ extension DependencyValues {
   ///
   ///   @Dependency(\.uuid) var uuid
   ///
-  ///   func reduce(into state: inout State, action: Action) -> Effect<Action> {
+  ///   func reduce(into state: inout State, action: Action) -> Effect<Action, Never> {
   ///     switch action {
   ///     case .create:
   ///       state.append(Todo(id: self.uuid())