Updated Dream Eater/Liquid Ooze's interaction to Gen 5 standards (#7528)

docs/tutorials/how_to_testing_system.md

@@ -428,7 +428,7 @@ Spaces in pattern match newlines (\n, \l, and \p) in the message.
 Often used to check that a battler took its turn but it failed, e.g.:
 ```
      MESSAGE("Wobbuffet used Dream Eater!");
-     MESSAGE("The opposing Wobbuffet wasn't affected!");
+     MESSAGE("It doesn't affect the opposing Wobbuffet…");
 ```
 
 ### `STATUS_ICON`