Remove numbering in favor of bullet points
Remove numbering in favor of bullet points

- For some reason Github incorrectly displayed the
  numbering for the paragraphs in 'Adding the Presto service'
  section.
- Add bullet points for each known issue to make it
  clear which paragraph starts talking about a new issue and
  which one expands on a previous one.

TeradataCenterForHadoop/ambari-presto-service,prestodb/ambari-presto-service