Template:YouTube/doc

First example: Becomes Using this code:
 * https://www.youtube.com/channel/UCRkCifCbAw0qwu7XzOa9d7w

Second example: Becomes Using this code:
 * https://www.youtube.com/c/wadaayaka

Third example: Becomes Using this code:
 * http://www.youtube.com/user/morningmusumechannel