Fix formatting

[tilsammans]

GitHub's markdown doesn't allow code blocks inside a list. The README would show a 'ruby' string prepended to the documentation. I just moved it to an inline code block. Also fixed minor formatting.

[sankage]

GitHub markdown does allow code blocks in lists, you just have to put a line break in between and properly indent. Its like if you have multiple paragraphs in a list element.

1. Example

  ```ruby
  puts "example ruby"
  '``
2. second list element

1. Example

   puts "example ruby"

2. second list element

[avdi]

I think @saturnflyer got to it first...