This looks good to me, except a phrasing nitpick.
https://codereview.appspot.com/566540043/diff/566530044/Documentation/contributor/source-code.itexi
File Documentation/contributor/source-code.itexi (right):
I guess that most GNOME users nowadays use version 3, so we should use
the gsettings command instead of GConf.
https://codereview.appspot.com/566540043/diff/566530044/Documentation/contributor/source-code.itexi
File Documentation/contributor/source-code.itexi (right):
It's too long I had to follow those lines, thus I can't say anything to
your changes.
One nit:
https://codereview.appspot.com/566540043/diff/566530044/Documentation/contributor/source-code.itexi
File Documentation/contributor/source-code.itexi (right):
