text improvement

Author: TorkelE

src/chemistry_functionality.jl

@@ -61,7 +61,7 @@ function make_compound(expr)
     isempty(ivs) && (species_expr = insert_independent_variable(species_expr, :(..)))      
 
     # Expression which when evaluated gives a vector with all the ivs of the components.
-    ivs_get_expr = :(unique(reduce(vcat,[arguments(ModelingToolkit.unwrap(iv)) for iv in $components])))    
+    ivs_get_expr = :(unique(reduce(vcat,[arguments(ModelingToolkit.unwrap(comp)) for comp in $components])))    
 
     # Creates the found expressions that will create the compound species.
     # The `Expr(:escape, :(...))` is required so that the expressions are evaluated in