Aleks/global variable mfa (#30616)

* Update _index.md with MFA recommendation

Update for GV MFA token creation to address recurring questions around supportability of the various MFA providers used by customers.

**Note:** If your TOTP token works in Google Authenticator, it will also work with Datadog’s TOTP browser test feature.

However, be aware that some MFA providers, such as Duo and Okta, enforce tighter control over how QR codes are interpreted. QR codes generated by these systems might only be valid within their own verification apps (e.g., Duo Mobile or Okta Verify) and may **not** work with general-purpose TOTP authenticators (like Google Authenticator) or Datadog. This is a restriction enforced by the identity provider, not Datadog. To work around this, ensure your QR code or TOTP secret is configured for compatibility with standard TOTP generators.

* Update _index.md with MFA note

Updated for brevity

**Note:** If your TOTP token works in Google Authenticator, it is likely compatible with Datadog.
Some QR codes are restricted to specific verification methods and may not work elsewhere. To ensure compatibility, use a QR code or secret that follows standard TOTP protocols.

* Update content/en/synthetics/platform/settings/_index.md

Thank you for the review, noted on the adjustment!

Co-authored-by: Alicia Scott <aliciascott@users.noreply.github.com>

* Update content/en/synthetics/platform/settings/_index.md

Thank you for the review, noted on the adjustment!

Co-authored-by: Alicia Scott <aliciascott@users.noreply.github.com>

---------

Co-authored-by: Alicia Scott <aliciascott@users.noreply.github.com>

Author: aleks-dog

content/en/synthetics/platform/settings/_index.md

@@ -243,6 +243,9 @@ To generate and use a TOTP in your tests, create a global variable where you ent
 
 {{< img src="synthetics/guide/browser-tests-totp/new-variable-totp.png" alt="Create a MFA token" style="width:100%;" >}}
 
+**Note**: If your TOTP token works in Google Authenticator, it is likely compatible with Datadog.
+Some QR codes are limited to specific verification methods and may not work across platforms. To ensure compatibility, use a QR code or secret that follows standard TOTP protocols.
+
 For more information about TOTP-based MFA in a browser test, see [TOTPs For Multi-Factor Authentication (MFA) In Browser Tests][1].
 
 [1]: /synthetics/guide/browser-tests-totp