Minor typo at 01_struct.toml#L70; istead -> instead

[Delta456]

trainer/challenge/files/01_structs.toml

Line 70 in 57a5449

{ text = "New structure istead of field change", code_line_ranges = [[4, 7]] },

As you can see there's a minor typo here. It should be instead instead of istead.

[Delta456]

Can make PR if required

[rusinikita]

@Delta456 Thanks for that finding. I will fix that soon.