doc: fix type references for link gen, link css

doc: fix type references for link gen, link css

Fixes several type references in the docs so that the
doc html gen tool that parses them can put the correct
links in.

Changes css styling for the generated type links.

PR-URL: https://github.com/nodejs/node/pull/4741
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Chris Dickinson <chris@neversaw.us>
Reviewed-By: Roman Reiss <me@silverwind.io>