Adjust the comment in contrib/download_prerequisties.

contrib/
	* download_prerequisites: Modify the comment for GRAPHITE_LOOP_OPT.

From-SVN: r218652

contrib/ChangeLog

+2014-12-12  Chung-Ju Wu  <jasonwucj@gmail.com>
+
+	* download_prerequisites: Modify the comment for GRAPHITE_LOOP_OPT.
+
 2014-12-09  Laurynas Biveinis  <laurynas.biveinis@gmail.com>
 	    Yury Gribov  <y.gribov@samsung.com>
 

contrib/download_prerequisites

@@ -19,9 +19,9 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see http://www.gnu.org/licenses/.
 
-# If you want to build GCC with the Graphite loop optimizations,
-# set GRAPHITE_LOOP_OPT=yes to download optional prerequisties
-# ISL Library and CLooG.
+# If you want to disable Graphite loop optimizations while building GCC,
+# DO NOT set GRAPHITE_LOOP_OPT as yes so that the ISL package will not
+# be downloaded.
 GRAPHITE_LOOP_OPT=yes
 
 # Necessary to build GCC.