Fix rebase changes

- Remove `Flux.testmode!` reference (the function no longer exists).
- Change TrackedArray to Array in doctest (Tracker -> Zygote).

src/layers/normalise.jl

@@ -30,7 +30,7 @@ end
 """
     Dropout(p, dims = :)
 
-A Dropout layer. In the forward pass, applies the [`dropout`](@ref) function on the input.
+Dropout layer. In the forward pass, applies the [`Flux.dropout`](@ref) function on the input.
 
 Does nothing to the input once [`Flux.testmode!`](@ref) is `true`.
 """