[PATCH] import: mention "stdin" (abbreviated) and add example

[Yuya Nishihara]

On Fri, 10 Feb 2017 15:26:21 -0800, Martin von Zweigbergk via Mercurial-devel wrote:
> # HG changeset patch
> # User Martin von Zweigbergk <martinvonz at google.com>
> # Date 1486769163 28800
> #      Fri Feb 10 15:26:03 2017 -0800
> # Node ID 08b61c8629f931408318e099960b65812e138ec9
> # Parent  a95fc01aaffe805bcc4c02a822b82a1162fa35b9
> import: mention "stdin" (abbreviated) and add example

Nice. Queued, thanks.