doc: replace v8::Handle<T> with v8::Local<T>
doc: replace v8::Handle<T> with v8::Local<T>

v8::Handle is on its way out, to be replaced with v8::Local.  Update the
addons documentation accordingly.

PR-URL: https://github.com/iojs/io.js/pull/1125
Reviewed-By: Rod Vagg <f9f03903429036ef609ed7ca822fddfa76155c29@vagg.org>
Reviewed-By: Trevor Norris <9cb5491eb5770dd8e0bf77a8a0335abf5f0488c5@gmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node