Merge pull request #4215 from lamby/correct-faield-spelling

Correct spelling of "faield".

tests/instances.tcl

@@ -318,7 +318,7 @@ proc end_tests {} {
         puts "GOOD! No errors."
         exit 0
     } else {
-        puts "WARNING $::failed tests faield."
+        puts "WARNING $::failed test(s) failed."
         exit 1
     }
 }