“\n” is the standard newline character in most modern systems and it has the ASCII Code of 0x0A , it makes you print what is after it in a new line.
Example :

disp("bla bla\ntesting more bla bla")

This prints :

bla bla
testing more bla bla

So it basically starts a new line for written text.
1:1:10 in for loops mean the iteration from 1 to 10, with a step of 1 number between each iteration like :

for x = 1:1:10
disp(x)
end

This prints :

1 2 3 4 5 6 7 8 9 10

How about combining both ?

for x = 1:1:10
sprintf(' %d \n' , x)
end

This prints :

1
2
3
4
5
6
7
8
9
10

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