[Docs] Missing curly brackets for the csv flag.

[vmeet24]

Description

Issue on this page: https://docs.yugabyte.com/preview/explore/going-beyond-sql/connection-mgr-ysql/#how-to-use

Please update this command:
./bin/yugabyted start --tserver_flags "enable_ysql_conn_mgr=true,allowed_preview_flags_csv=enable_ysql_conn_mgr" --ui false

To include the curly brackets for the csv flag

./bin/yugabyted start --tserver_flags "enable_ysql_conn_mgr=true,allowed_preview_flags_csv={enable_ysql_conn_mgr}" --ui false

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