Display escaped '\n' instead of actual newline in rules table

[gsingh93]

I was confused on why a rule was giving a false positive, so I checked options_demo.js and found the actual rule was Index(.|\n)*modified instead of Index(.| )*modified, but the rules table was displaying the latter. There's an actual newline in the HTML, which gets rendered as a space. This should be rendered as '\n' instead.