Some people have misread this section to imply that libuv does not
support Unix `pipe` objects, while it only should be saying that the
UV_CREATE_PIPE makes a socketpair. Clarify the docs to say specifically
that `uv_pipe_t` represents any local file stream.
PR-URL: https://github.com/libuv/libuv/pull/2607
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>