doc: skip type parsing inside code blocks

Since types are denoted with curly braces it can cause erroneous
replaces in code blocks.

Signed-off-by: Trevor Norris <trev.norris@gmail.com>
node: clear nextTickQueue when using domains

When the domain specific code was reintroduced in 828f145 the
conditional to check and clear the nextTickQueue if many items had run
was not introduced. This allows for the application to run out of memory
if domains are being used in an infinite recursive loop.