Updated CES limitations around online index operations (#35794)

* Updated CES limitations around online index operations

CES does not support online index operations. I have added a clarification on this.

* Update docs/relational-databases/track-changes/change-event-streaming/configure.md

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Co-authored-by: nzagorac-ms <118456134+nzagorac-ms@users.noreply.github.com>

Author: MashaMSFT

docs/relational-databases/track-changes/change-event-streaming/configure.md

@@ -551,7 +551,9 @@ The following limitations apply when using CES with Azure SQL Database:
 - A table can belong to only one streaming group. You can't stream the same table to multiple destinations.
 - You can only configure user tables for CES. CES doesn't support streaming system tables.
 - You can configure up to 4,096 stream groups. Each stream group can include up to 40,000 tables.
+- [Online index operations](/sql/relational-databases/indexes/perform-index-operations-online) are not supported
 - While CES is enabled on a table, you can't add or drop a primary key constraint on that table.
+
 - `ALTER TABLE SWITCH PARTITION` isn't supported on tables configured for CES.
 - `TRUNCATE TABLE` isn't supported on tables enabled for CES.
 - CES doesn't support tables that use any of the following features: