fixed example

Author: racinmat

docs/Project.toml

@@ -1,2 +1,3 @@
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+MLDatasets = "eb30cadb-4394-5ae3-aed4-317e484a6458"

src/Mutagenesis/Mutagenesis.jl

@@ -12,15 +12,15 @@ The `Mutagenesis` dataset comprises 188 molecules trialed for mutagenicity on Sa
 
 Train, test and validation data can be loaded using:
 ```jldoctest
-julia> using Mutagenesis
+julia> using MLDatasets: Mutagenesis
 
 julia> train_x, train_y = Mutagenesis.traindata();
 
 julia> test_x, test_y = Mutagenesis.testdata();
 
 julia> val_x, val_y = Mutagenesis.valdata();
 
-julia> train_x[1:2]
+julia> train_x[1]
 JSON3.Object{Base.CodeUnits{UInt8,String},SubArray{UInt64,1,Array{UInt64,1},Tuple{UnitRange{Int64}},true}} with 6 entries:   
   :ind1      => 1
   :inda      => 0