Update mtx.txt

Author: Will Kimmerer

benchmarks/mtx.txt

@@ -3,15 +3,15 @@
 # /home/faculty/d/davis/Freescale2.mtx
 2662
 # /home/faculty/d/davis/indochina-2004.mtx
-2451
+# 2451
 # /home/faculty/d/davis/nd24k.mtx
-939
+# 939
 # /home/faculty/d/davis/nd6k.mtx
-937
+# 937
 # /home/faculty/d/davis/roadNet-CA.mtx
 # /raid/GAP/GAP-twitter/GAP-twitter.mtx
 # /raid/GAP/GAP-road/GAP-road.mtx
-2854
+# 2854
 # /raid/GAP/GAP-web/GAP-web.mtx
 # /raid/GAP/GAP-urand/GAP-urand.mtx
 # /raid/GAP/GAP-kron/GAP-kron.mtx