Add couple of YT links

Author: andrei-punko

src/main/java/by/andd3dfx/numeric/ProductOfArrayExceptSelf.java

@@ -18,6 +18,8 @@
  * Input: nums = [-1,1,0,-3,3]
  * Output: [0,0,9,0,0]
  * </pre>
+ *
+ * @see <a href="https://youtu.be/DY1XhqN4e9g">Video solution</a>
  */
 public class ProductOfArrayExceptSelf {
 

src/main/java/by/andd3dfx/string/ReverseWordsInAStringIII.java

@@ -14,6 +14,8 @@
  *   Input: s = "Mr Ding"
  *   Output: "rM gniD"
  * </pre>
+ *
+ * @see <a href="https://youtu.be/gwQfBcIDa7s">Video solution</a>
  */
 public class ReverseWordsInAStringIII {