[docs] Not enabling "net changes" feature in SQL Server CDC config;

It's not leveraged by Debezium atm., so enabling this feature isn't providing any value, but adds a cost of additinal indexes.

documentation/modules/ROOT/pages/connectors/sqlserver.adoc

@@ -82,7 +82,7 @@ EXEC sys.sp_cdc_enable_table
 @source_name   = N'MyTable',
 @role_name     = N'MyRole',
 @filegroup_name = N'MyDB_CT',
-@supports_net_changes = 1
+@supports_net_changes = 0
 GO
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