Fix some parser test syntax errors

Errors include typos ("DESCRIPT__ON"), missing value after #=EXRESULT
and #=EXRESULT=PASS (= instead of space).


Acked-by: Steve Beattie <steve@nxnw.org> for trunk and 2.9

parser/tst/simple_tests/conditional/stress_1.sd

@@ -1,4 +1,4 @@
-#=DESCRIPTON simple stress test nested ifs
+#=DESCRIPTION simple stress test nested ifs
 #=EXRESULT PASS
 $a1 = true
 $a2 = true

parser/tst/simple_tests/signal/rtsig_01.sd

@@ -1,6 +1,6 @@
 #
 #=DESCRIPTION simple rtsig test
-#=EXRESULT=PASS
+#=EXRESULT PASS
 #
 
 /usr/bin/signal-test {

parser/tst/simple_tests/signal/rtsig_02.sd

@@ -1,6 +1,6 @@
 #
 #=DESCRIPTION simple rtsig test
-#=EXRESULT=PASS
+#=EXRESULT PASS
 #
 
 /usr/bin/signal-test {

parser/tst/simple_tests/vars/vars_assignment_reference_1.sd

@@ -1,5 +1,5 @@
 #=DESCRIPTION set variable assignment using set variable as rvalue
-#=EXRESULT
+#=EXRESULT PASS
 
 @{FOO}=bar baz
 @{BAR}=${FOO} blort