* Make a URL into an HTML link using anchor tag
* Put code in fixed-width font
* Since the MinGW footnote is significantly more than the rest of the footnotes
combined, it needs to have a border and background color to separate it from
the regular flow of text for readability purposes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20093 91177308-0d34-0410-b5e6-96231b3b80d8