Remove Privacy Pro line from release notes (#2902)

Task/Issue URL: https://app.asana.com/0/414235014887631/1207438971509830/f
Tech Design URL:
CC:

Description:

Updates release notes to remove Privacy Pro reference.

fastlane/metadata/default/release_notes.txt

@@ -1,5 +1,5 @@
 For Privacy Pro subscribers:
     New VPN widget! You can now view and manage your VPN connection right on the Home Screen.
-    Visit https://duckduckgo.com/pro for more information. Privacy Pro is currently available to U.S. residents only.
+    Privacy Pro is currently available to U.S. residents only.
 
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