linux-imx

Documentation/BUG-HUNTING: convert to ReST markup

- Add a document title and remove its own index;
- use monotonic fonts for paths;
- use quote blocks where needed;
- adjust/use spaces to properly format paragraphs;
- add it to the user book.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>