Hi
Yes, you can remove that line if you want. Then it would be default Cisco/Cisco would be the default credential.
Anytime you can create a user & delete the default credential. Here is an example how I create a user called "admin" with password "Cisco123" while deleting the default user.
AAP1(config)#no username Cisco
AAP1(config)#username admin password 0 Cisco123
Also make sure you change enable password as well (by default Cisco)
AAP1(config)#enable secret xxxx
HTH
Rasika
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