Can you use the official Pokedex to paste in the descriptions. This way there is no spelling errors. Not that you did anything like that, just a reminder that the descriptions are pulled from the site.
Currently, they're intended for use on the Move pages to show how the moves have been changed over time in their own section, like here. "Buff" is a common word in gaming for improvement, while "Nerf" represents the same for adding weakness. However, they're only used for the template names as a shorthand, to avoid confusion for more casual users.