bug#33780: network-stream.el: network-stream-certificate always returns nil

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Vinothan Shankar <darael@dracon.is>, eliz@gnu.org, Ted Zlatanov 
> <tzz@lifelogs.com>
> Date: Wed, 09 Jan 2019 11:48:46 +0100

Thanks, a few comments regarding the Texinfo part:

> +Passing @code{:client certificate t} triggers looking up of client
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This should be wrapped in @w{..}, otherwise makeinfo might divide it
between two lines.

> +certificates matching @var{host} and @var{service} using the
> +'auth-source' library.  Any resulting client certificates are passed

auth-source should be in @file, and without the quotes.

> +down to the lower TLS layers.  The format used by @file{.authinfo} to
> +specify the per-server keys is described in @xref{Help for
> +users,,auth-source, auth, Emacs auth-source Library}.

@xref can only be used at the beginning of a sentence, as it generates
a capitalizes "See".  Use "see @ref" instead here.