update legacy alert syntax

Author: jwmsft

hub/apps/develop/security/export-restrictions-cryptography.md

@@ -15,7 +15,8 @@ Use this info to determine if your app uses cryptography in a way that might pre
 
 The Bureau of Industry and Security in the United States Department of Commerce regulates the export of technology that uses certain types of encryption. All apps listed in the Microsoft Store must comply with these laws and regulations because the app files can be stored in the United States. Even apps that are uploaded by app developers from other countries/regions for distribution outside of the United States must comply with these regulations. Consequently, when submitting an app to the Microsoft Store, all app developers must make sure that their apps don't contain any technology that is restricted by these regulations.
 
-> **Note**  The information provided here provides some guidance, but it is your responsibility as the app developer who is publishing apps in the Microsoft Store to make sure that your app complies with all applicable laws and regulations.
+> [!NOTE]
+> The information provided here provides some guidance, but it is your responsibility as the app developer who is publishing apps in the Microsoft Store to make sure that your app complies with all applicable laws and regulations.
 
 
 
@@ -27,7 +28,8 @@ For info about the Export Administration Regulations (EAR) that govern the expor
 
 First, determine if your app uses a type of cryptography that is governed by the Export Administration Regulations. The question includes the examples shown in the list here; but remember that this list doesn't include every possible application of cryptography.
 
-> **Important**  Consider not only the code you wrote for your app, but also all the software libraries, utilities and operating system components that your app includes or links to.
+> [!IMPORTANT]
+> Consider not only the code you wrote for your app, but also all the software libraries, utilities and operating system components that your app includes or links to.
 
 -   Any use of a digital signature, such as authentication or integrity checking
 -   Encryption of any data or files that your app uses or accesses