Fix incorrect markdown formatting of unordered lists in example job descriptions.

As you can see in the Person Spec on this page - https://www.gov.uk/service-manual/the-team/web-operations-jd.html - The bullet points are messed up due to bad markdown formatting.
I have fixed this for all similar job specs. I have left the designer spec as that wasn't explicitly broken and formatted differently to the rest.
I have opted for making the headers h4s instead of paragraphs, but can redo with paragraphs if that's thought to better.