Update exam2.md

larger indenting
Formatting changes

Added proper indentation.  I tried to match the nesting to how
Github was rending the markdown.  Apparently pandoc expects it a
little different.  Specifically:

 * Level 1 indent
    * Level 2 indent
    * Another level 2 indent (note space-space-space-space-star-space)
 * Level 1 indent (note space-start-space)