update link to barcode scanner docs

Author: iamgabrielma

WooCommerce/Classes/POS/Presentation/PointOfSaleBarcodeScannerInformationModal.swift

@@ -118,7 +118,7 @@ struct ProductBarcodeSetupInformation: View {
     private var productSetupTextWithLink: AttributedString {
         let mainContent = Localization.productBarcodeSetupMessage
         let linkText = Localization.productBarcodeSetupLinkText
-        let link = Constants.detailsLink?.absoluteString ?? ""
+        let link = Constants.detailsLink.absoluteString
 
         let content = String.localizedStringWithFormat(mainContent, linkText)
         var attributedText = AttributedString(content)
@@ -136,7 +136,7 @@ struct ProductBarcodeSetupInformation: View {
 }
 
 private enum Constants {
-    static let detailsLink = URL(string: "https://woocommerce.com/document/barcode-and-qr-code-scanner/")
+    static let detailsLink = WooConstants.URLs.pointOfSaleBarcodeScannerDocumentation.asURL()
 }
 
 private enum Localization {

WooCommerce/Classes/POS/Presentation/Settings/PointOfSaleSettingsHardwareDetailView.swift

@@ -67,7 +67,7 @@ struct PointOfSaleSettingsHardwareDetailView: View {
                 PointOfSaleBarcodeScannerSetup(isPresented: $showBarcodeScanningSetupModal)
             }
             .posFullScreenCover(isPresented: $showBarcodeScanningDocumentationModal) {
-                SafariView(url: WooConstants.URLs.pointOfSaleDocumentation.asURL())
+                SafariView(url: WooConstants.URLs.pointOfSaleBarcodeScannerDocumentation.asURL())
             }
         }
     }

WooCommerce/Classes/System/WooConstants.swift

@@ -254,6 +254,10 @@ extension WooConstants {
         ///
         case pointOfSaleDocumentation = "https://woocommerce.com/document/woo-mobile-app-point-of-sale-mode/"
 
+        /// URL for Point of Sale's barcode scanner documentation
+        ///
+        case pointOfSaleBarcodeScannerDocumentation = "https://woocommerce.com/document/barcode-and-qr-code-scanner/"
+
         /// Temporary redirect URL for authenticated web view when authenticating WPCom automatically
         ///
         case wpcomTempRedirectURL = "https://wordpress.com/mobile-redirect"