Remove duplicates in git_setup

Author: kwankyu

src/doc/en/developer/git_setup.rst

@@ -4,21 +4,13 @@
 Setting Up Git
 ==============
 
-To work on the Sage source code, you need a working Git installation,
-configured at least to use your name and email address for commits.
-
-For further information about Git, see :ref:`chapter-git-background`, but this
-is not required for a beginning Sage developer.
-
 
 .. _section-git-install:
 
 Installing Git
 --------------
 
-First, try Git on the command line by typing ``git``. Most platforms will have it installed by
-default if other development tools are installed. If that fails, use the
-following to install Git:
+Depending on your platform, use the following to install Git:
 
 Debian / Ubuntu
     Run ``sudo apt-get install git-core``
@@ -54,11 +46,7 @@ Some further resources for installation help are:
 Configuring Git
 ---------------
 
-The commit message of any change contains your name and email address to
-acknowledge your contribution and to have a point of contact if there are
-questions in the future. Filling it in is required if you want to share your
-changes. The simplest way to do this is from the command line. Assuming your
-name ``alice`` and email address ``[email protected]``,
+Assuming your name ``alice`` and email address ``[email protected]``,
 
 .. CODE-BLOCK:: shell-session
 
@@ -77,3 +65,6 @@ This will write the settings into your :ref:`Git configuration file
 Of course, replace ``Alice Adventure`` and ``[email protected]`` with your
 actual name and email address.
 
+This is the basic Git configuration for now. For further tips on configuring
+Git, see :ref:`section-git-configuration`.
+

src/doc/en/developer/walkthrough.rst

@@ -40,7 +40,7 @@ Don't worry about the giant list of subcommands. You really only need a handful
 of them for effective development, and we will walk you through them in this
 guide. If you got a "command not found" error, then you don't have Git
 installed; now is the time to install it. See
-:ref:`chapter-git-setup` for instructions.
+:ref:`section-git-install` for instructions.
 
 Because we also track who does what changes with Git, you must tell
 Git how you want to be known. Check if Git knows you::