Update samples/VanillaJSTestApp/app/adfs/Readme.md
Update samples/VanillaJSTestApp/app/adfs/Readme.md

Co-authored-by: Héctor Morales <8356697c47bd6b818542fa8ba540562d18771ce1@hey.com>
AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js