doc: Update net.markdown

Associates link to dns.lookup() with proper URL.

Fixes: https://github.com/joyent/node/issues/8018
Reviewed-by: Trevor Norris <trev.norris@gmail.com>
Reviewed-by: Chris Dickinson <christopher.s.dickinson@gmail.com>
doc: improve readLine.pause()

The docs for readLine.pause are misleading. I seriously spent hours on this. If
it isn't a bug, at least it should be well documented.

Someone else stumbled on this too:
http://stackoverflow.com/questions/21341050/pausing-readline-in-node-js

Reviewed-by: Trevor Norris <trev.norris@gmail.com>
Reviewed-by: Chris Dickinson <christopher.s.dickinson@gmail.com>
url: fixed encoding for slash switching emulation.

Fixes: https://github.com/joyent/node/issues/8458
Reviewed-by: Trevor Norris <trev.norris@gmail.com>
Reviewed-by: Chris Dickinson <christopher.s.dickinson@gmail.com>