Update cachestat_example.txt
typo fix
@@ -72,7 +72,7 @@ This output shows a 1 Gbyte file being created and added to the page cache:
0 0 96505 0.00% 8 1233
0 0 0 0.00% 8 1233
-Note the high rate of DIRTIES, and the CACHED_MD size increases by 1024 Mbytes.
+Note the high rate of DIRTIES, and the CACHED_MB size increases by 1024 Mbytes.
USAGE message:
