fix the hw1 assignment

2023/2023-03-09_ProgrammingWithJulia-2/slides/1e-exercises.md

@@ -72,6 +72,6 @@ Make a *faster* version of the maze distance computation.
 
 Submission:
 - wrap your code into a package `MagicMaze`
-- include a function `maze_distance_map(x::Int, y::Int)::Matrix{Int}`
+- include a function that computes the distances, with a type signature such as `maze_distance_map(maze::Matrix{Bool}, x::Int, y::Int)::Matrix{Int}`
 - write a unit test that demonstrates the result
 - pack the package and upload it to Moodle