Fix problems with code section characters in readme files - lc problem: No.0019

Author: djvelimir

solution/0000-0099/0019.Remove Nth Node From End of List/README.md

@@ -280,7 +280,7 @@ var removeNthFromEnd = function (head, n) {
 
 #### Swift
 
-````swift
+```swift
 /**
  * Definition for singly-linked list.
  * public class ListNode {
@@ -412,4 +412,3 @@ class Solution {
 <!-- solution:end -->
 
 <!-- problem:end -->
-````

solution/0000-0099/0019.Remove Nth Node From End of List/README_EN.md

@@ -277,7 +277,7 @@ var removeNthFromEnd = function (head, n) {
 
 #### Swift
 
-````swift
+```swift
 /**
  * Definition for singly-linked list.
  * public class ListNode {
@@ -409,4 +409,3 @@ class Solution {
 <!-- solution:end -->
 
 <!-- problem:end -->
-````