HPCC-12996 Clean up a couple of error messages

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

testing/regress/hpcc/common/error.py

@@ -29,8 +29,8 @@ ERROR = {
     "4000": "Unknown cluster!",
     "4001": "No ECl file!",
     "5000": "Missing argument of -X parameter!\nIt should be 'name=val[,name2=val2..]'",
-    "6000": "HPCC System not istalled!",
-    "6001": "HPCC System doesn't run!",
+    "6000": "HPCC System is not installed!",
+    "6001": "HPCC System is not running!",
     "6002": "OS error when try to call ecl command!",
     "6003": "Parameter error when try to call ecl command!",
 }