"of cause" should have been "of course" but is not needed anyway

#noticed by Zeev

tests/classes/abstract.phpt

@@ -22,7 +22,7 @@ $t = new pass();
 $t->show();
 $t->error();
 
-echo "Done\n"; // shouldn't be displayed of cause
+echo "Done\n"; // shouldn't be displayed
 ?>
 --EXPECTF--
 Call to function show()

tests/classes/abstract_class.phpt

@@ -21,7 +21,7 @@ $t2->show();
 $t = new fail();
 $t->show();
 
-echo "Done\n"; // shouldn't be displayed of cause
+echo "Done\n"; // shouldn't be displayed
 ?>
 --EXPECTF--
 Call to function show()

tests/classes/static_mix_1.phpt

@@ -20,7 +20,7 @@ class fail extends pass {
 pass::show();
 fail::show();
 
-echo "Done\n"; // shouldn't be displayed of cause
+echo "Done\n"; // shouldn't be displayed
 ?>                                                            
 --EXPECTF--
 Fatal error: Cannot make static method pass::show() non static in class fail in %s on line %d

tests/classes/static_mix_2.phpt

@@ -21,7 +21,7 @@ $t = new pass();
 $t->show();
 fail::show();
 
-echo "Done\n"; // shouldn't be displayed of cause
+echo "Done\n"; // shouldn't be displayed
 ?>
 --EXPECTF--
 Fatal error: Cannot make non static method pass::show() static in class fail in %s on line %d