Edit Citation.md example in Citation episode

Fix typo in example CITATION.MD file. The correct format should be: Dracula, V. and Wolfman, L.T., 2024, Vampires and Werewolves, version 1.0.0: U.S. Geological Survey, https://doi.org/10.5066/xxxxxxxx.

Also, wrap the bibtext citation in triple ticks ```