Finished editing "Functional Programming"

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Functional Programming/Folding Lists/Exercise 4/task.md

@@ -3,5 +3,5 @@
 The starter code provides a `Condition` class and a function
 `Condition.combine()` that combines two conditions. There's also a skeleton
 for the `List<Condition>` extension function `combineAll()` that combines all
-the conditions in the `List`. Complete the implementation using `reduce()`,
+conditions in the `List`. Complete the implementation using `reduce()`,
 assuming the `List` is non-empty.