Correct PIN format and restart app instruction

Updated instructions for enabling developer mode and configuring the Dummy Payment Provider.

Author: deboragracio

README.MD

@@ -60,12 +60,12 @@ The InStore App supports a developer mode. When enabled, a hidden **Dummy Paymen
 
 1. Start the InStore App and navigate to the home screen.
 2. At the bottom of the screen, tap the **fiskaltrust** logo five times to open the Developer Mode PIN entry dialog.
-3. Enter the PIN: 4242.
+3. Enter the PIN: `4242`.
 4. If successful, an information dialog will appear confirming that Developer Mode is enabled. Tap OK to close the dialog; the app will then exit automatically.
 
 **Configuring the Dummy Payment Provider**
 
-1. Start the InStore App.
+1. Restart the InStore App.
 2. Open **Settings** and navigate to the **Payment settings** section.
 3. Tap on **Payment entry** (the first item in **Payment Settings**) and select the **Dummy Payment Provider**, which is now visible because the developer mode is active.