bug#23411: 25.1.50; Outdated documentation of url-retrieve-synchronously

[Chunyang Xu]

The arguments of url-retrieve-synchronously is:

(url-retrieve-synchronously URL &optional SILENT INHIBIT-COOKIES)

however, SILENT and INHIBIT-COOKIES is not documented in the docstring.


And in info node (info "(url) Retrieving URLs"), the optional arguments
are not mentioned in the function prototype:

-- Function: url-retrieve-synchronously url


In GNU Emacs 25.1.50.1 (x86_64-apple-darwin15.4.0, NS appkit-1404.46 Version 
10.11.4 (Build 15E65))
 of 2016-04-25 built on MBA.local
Repository revision: 12846626bfae795a173fdedf2850dfbd24065534
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
 'configure --with-modules'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS MODULES

Important settings:
  value of $LANG: en_CN.UTF-8
  locale-coding-system: utf-8-unix