Adjust note on Vanguard 2FA, SMS backup is not required (2factorauth#8384)

Signed-off-by: Colton Voege <[email protected]>
Co-authored-by: Carl <[email protected]>

Author: cvoege

entries/v/vanguard.com.json

@@ -13,7 +13,7 @@
       "Voice Verification"
     ],
     "documentation": "https://investor.vanguard.com/security/security-keys",
-    "notes": "Hardware based 2FA requires SMS / Phone call 2FA as a backup.",
+    "notes": "Security keys can not be used to log in to mobile app or mobile website.",
     "categories": [
       "investing"
     ],