doc: fix grammar in tls and timers

Replace 'a' with 'an' where appropriate.
docs: fix streams example for write() after end()

Currently there's an example using http.ServerResponse stream, which
has a known bug and will not throw an error while writing after end().
Changed to a writable stream from fs which behaves as expected.

fix #8814

Signed-off-by: Julien Gilli <julien.gilli@joyent.com>
doc: clearer log messages in net code samples

Code examples in documentation for net.createServer and
net.createConnection contained confusing log messages. This change makes
them clearer.

Signed-off-by: Julien Gilli <julien.gilli@joyent.com>
deps: update libuv to 0.10.30

PR-URL: https://github.com/joyent/node/pull/8849
Reviewed-by: Trevor Norris <trev.norris@gmail.com>