Fix ordered list formatting

The rules are similar to those for the unordered lists (see previous
commits). Subsequent lines and paragraphs should be aligned to the
beginning of the sentence on the first line, like this:

  1. This is a list item,
     it has a second line.

     Also paragraph.

  2. Second list item.

         code fragment

Short, one-sentence items that can be read as part of the surrounding
paragraph can start with a non-capital letter