Update concept-fundamentals-security-defaults.md

Removing sentence on requiring two auth methods for global admins. We ran into issues with the feature such that we rolled it back completely. I'll make sure to add the sentence once we roll out the feature

Author: luc-msft

articles/active-directory/fundamentals/concept-fundamentals-security-defaults.md

@@ -142,8 +142,6 @@ This policy applies to all users who are accessing Azure Resource Manager servic
 
 Security defaults users are required to register for and use Azure AD Multi-Factor Authentication **using the Microsoft Authenticator app using notifications**. Users may use verification codes from the Microsoft Authenticator app but can only register using the notification option. 
 
-Starting in July 2022, anyone with the global administrator role assigned to them will be required to register a phone-based method like call or text as a backup method.
-
 > [!WARNING]
 > Do not disable methods for your organization if you are using security defaults. Disabling methods may lead to locking yourself out of your tenant. Leave all **Methods available to users** enabled in the [MFA service settings portal](../authentication/howto-mfa-getstarted.md#choose-authentication-methods-for-mfa).