Update loop variable names in code file

[sparce]

Split from PR #734

[maxim-belkin]

Could you please rebase your branch on top of the latest gh-pages?

git fetch origin gh-pages
git checkout -B gh-pages origin/gh-pages
git rebase gh-pages loop_var_names_code3
git push --force <your-fork>

You don't have fdf5ef2 in your branch and this causes a conflict here.

[maxim-belkin]

And again thank you, Stephen!