My suggestion would be: In the getting started section, as the second paragraph (i.e. after “first, download Julia”) insert a paragraph that reads something like:
If you are coming to Julia from one of the following languages, then you should start by reading the section on noteworthy differences from Matlab, R, Python, C/C++ or Common Lisp. This will help you avoid some common pitfalls since Julia differs from those languages in many subtle ways.
Edit: Since this post received several “likes”, I turned it into a pull request.