fix(data_transfer.md): correct syntax of referer

Signed-off-by: Norwid Behrnd <[email protected]>

Author: nbehrnd

source/learn/f95_features/data_transfer.md

@@ -61,7 +61,7 @@ print form, q
 ```
 
 or as an asterisk this is a type of I/O known as *list-directed* I/O
-(see [below](list-directed-i/o),
+(see [below](list-directed-i-o),
 in which the format is defined by the computer system:
 
 ```f90