Update StackOverflow tag in CONTRIBUTING.md

Author: Chicc

.github/CONTRIBUTING.md

@@ -11,7 +11,7 @@ Generally speaking questions are better suited in our resources below.
 - The official support server: https://discord.gg/UCXwPR7Pew
 - The Discord API server under #python_discord-py: https://discord.gg/discord-api
 - [The FAQ in the documentation](https://docs.pycord.dev/en/master/faq.html)
-- [StackOverflow's `discord.py` tag](https://stackoverflow.com/questions/tagged/discord.py)
+- [StackOverflow's `pycord` tag](https://stackoverflow.com/questions/tagged/pycord)
 
 Please try your best not to ask questions in our issue tracker. Most of them don't belong there unless they provide value to a larger audience.