YAML CPP: Fix minor spelling mistake in comment
@@ -30,7 +30,7 @@ using KeySetPair = pair<KeySet, KeySet>;
*
* @param keys This parameter contains the key set this function searches for array parents.
*
- * @return A key sets that contains all array parents stored in `keys`
+ * @return A key set that contains all array parents stored in `keys`
*/
KeySet splitArrayParents (KeySet const & keys)
{
