Doc: CG - replace all references of Google Code

Documentation/contributor/source-code.itexi

 @c -*- coding: utf-8; mode: texinfo; -*-
 
 
 @node Working with source code
 @chapter Working with source code
 
 @warning{New contributors should read @ref{Quick start}, and in
 particular @ref{lily-git}, instead of this chapter.}
 
 Advanced contributors will find this material quite useful,
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 @enumerate
 @item
 If you haven't already, download and install Git.
 
 @itemize
 
 @item Windows users: download the @code{.exe} file labeled
 @qq{Full installer for official Git} from:
 
 @example
-@uref{http://code.google.com/p/msysgit/downloads/list}
+@uref{https://git-for-windows.github.io/}
 @end example
 
 @item Other operating systems: either install @command{git} with
 your package manager, or download it from the @qq{Binaries}
 section of:
 
 @example
 @uref{http://git-scm.com/download}
 @end example
 
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 hexadecimal reference number called the @q{Committish} or @q{SHA1
 ID} which identifies the commit to Git.  Such committed changes
 can be sent to the master repository by @q{pushing} them (if you
 have write permission) or by sending them by email to someone who
 has, either as a complete file or as a @q{diff} or @q{patch}
 (which send just the differences from the master repository).
 
 @subsection Installing git
 
 Obtain Git from
-@uref{http://code.google.com/p/msysgit/downloads/list} (note, not
-msysGit, which is for Git developers and not PortableGit, which is
-not a full git installation) and install it.
+@uref{https://git-for-windows.github.io/}.
 
 Note that most users will not need to install SSH.  That is not
 required until you have been granted direct push permissions to
 the master git repository.
 
 Start Git by clicking on the desktop icon.  This will bring up a
 command line bash shell.  This may be unfamiliar to Windows users.
 If so, follow these instructions carefully.  Commands are entered
 at a $ prompt and are terminated by keying a newline.
 
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 @item
 Book about git: @uref{http://progit.org/,Pro Git}
 
 @item
 Github help: @uref{http://help.github.com/}
 (very highly recommended by Graham)
 
 @end itemize