fixes factor id

Author: rishabhpoddar

v2/mfa/important-concepts.mdx

@@ -16,7 +16,7 @@ Each auth challenge has a factor ID in SuperTokens:
 - Social login / enterprise SSO auth: `thirdparty`
 - Passwordless:
     - With email OTP: `otp-email`
-    - With SMS OTP: `sms-otp`
+    - With SMS OTP: `otp-phone`
     - With email magic link: `link-email`
     - With SMS magic link: `sms-link`
 - TOTP: `totp`