Small typo in expect code for test28.[345].

testsuite/expect/test28.3

@@ -84,7 +84,7 @@ expect {
 		send_user "\nFAILURE: sbatch did not submit jobs\n"
 		set exit_code 1
 	}
-	timout {
+	timeout {
 		send_user "\nFAILURE: sbatch not responding\n"
 		set exit_code 1
 	}

testsuite/expect/test28.4

@@ -112,7 +112,7 @@ expect {
 		send_user "\nFAILURE: sbatch did not submit jobs\n"
 		set exit_code 1
 	}
-	timout {
+	timeout {
 		send_user "\nFAILURE: sbatch not responding\n"
 		set exit_code 1
 	}

testsuite/expect/test28.5

@@ -148,7 +148,7 @@ expect {
 		send_user "\nFAILURE: sbatch did not submit jobs\n"
 		set exit_code 1
 	}
-	timout {
+	timeout {
 		send_user "\nFAILURE: sbatch not responding\n"
 		set exit_code 1
 	}