on this thread at the very bottom

on this thread at the very bottom
https://premium.wpmudev.org/forums/topic/i-named-my-global-database-name-can-i-name-the-global

it was mentioned to DO NOT ADD THIS LINE, ADD NOTHING TO THIS SECTION! I would like clarification.
because Step 3: db-config.php it instructs 3.Line 25: Provide the same name you assigned for your global database in Step 2. example ‘dbname_global’, what are you telling me thank you