This page is out of date in some areas (e.g. talks about "2.5.1a" as the
latest stable release, and describes CVS as the source control program,
not Git).
You can reach this page from the GNU Grep project home page -- it's in the
"Getting involved->Development" section. The project home page correctly
identifies Git as the source control facility, but it also has out-of-date
information about how to clone GNU Grep... the instructions should be (for
the "Anonymous clone" example):
git clone git://git.sv.gnu.org/grep.git
(Not "git clone git://git.savannah.gnu.org/grep.git".)