Fix documentation bug

Author: davidanthoff

docs/src/tutorial.md

@@ -77,7 +77,7 @@ We can now use Mimi to construct a model that binds the ``grosseconomy`` and ``e
 ```julia
 my_model = Model()
 
-setindex(my_model, :time, [2015:5:2110])
+setindex(my_model, :time, collect(2015:5:2110))
 
 addcomponent(my_model, grosseconomy)  #Order matters here. If the emissions component were defined first, the model would not run.
 addcomponent(my_model, emissions)
@@ -230,7 +230,7 @@ function run_my_model()
 
 	my_model = Model()
 
-	setindex(my_model, :time, [2015:5:2110])
+	setindex(my_model, :time, collect(2015:5:2110))
 	setindex(my_model, :regions, ["Region1", "Region2", "Region3"])	 #Note that the regions of your model must be specified here
 
 	addcomponent(my_model, grosseconomy)