Connection Manager stable docs flag update

[rahulb-yb]

Update stable version docs regarding a new flag that has been added to connection manager (ysql_conn_mgr_optimized_session_parameters). No need to update preview version docs as connection manager is not being actively supported on those versions.

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[ddhodge]

No need to update preview version docs as connection manager is not being actively supported on those versions

@anandvenkatesh Is this true? I'm not sure what this means tbh