Remove "Unicode Content" from table of contents (#10631)

Author: AhmedAlaa4611

notifications.md

@@ -36,7 +36,6 @@
 - [SMS Notifications](#sms-notifications)
     - [Prerequisites](#sms-prerequisites)
     - [Formatting SMS Notifications](#formatting-sms-notifications)
-    - [Unicode Content](#unicode-content)
     - [Customizing the "From" Number](#customizing-the-from-number)
     - [Adding a Client Reference](#adding-a-client-reference)
     - [Routing SMS Notifications](#routing-sms-notifications)