Fixed some formatting issues in chapter two

Because of a syntax error (missing new line), code sections
were not being ignored by RedCloth. That meant that macros like
RCLASS(value) were being interpreted as an acronym. RCLASS(value)
would become RCLASS and in theory tooltip with "value" would appear
on mouseover.

Additionally, using backticks to format code inline in a paragraph
does not work across line breaks. Any multi word inline code fragments
must be on the same line.