Update articles/active-directory/saas-apps/amazon-business-tutorial.md

Fix Acrolinx error

Author: denrea

articles/active-directory/saas-apps/amazon-business-tutorial.md

@@ -281,7 +281,7 @@ In this section, you test your Azure AD single sign-on configuration with follow
 
 * Click on **Test this application** in Azure portal. This will redirect to Amazon Business Sign-on URL where you can initiate the login flow.  
 
-* Go to Amazon Business Sign on URL directly and initiate the login flow from there.
+* Go to the Amazon Business Single Sign-on URL directly and initiate the login flow from there.
 
 #### IDP initiated: