Fix Discord link in Python migration guide (#13639)

Author: sentrivana

docs/platforms/python/migration/2.x-to-3.x.mdx

@@ -6,7 +6,7 @@ description: "Learn about migrating from sentry-python 2.x to 3.x"
 
 <Alert title="Python SDK 3.0 pre-release">
 
-Version 3.0 of the Sentry Python SDK is currently in pre-release. If you feel like giving it a spin, check out [our most recent releases](https://pypi.org/project/sentry-sdk/#history). Your feedback at this stage is invaluable, so please let us know about your experience, whether positive or negative, [on GitHub](https://github.com/getsentry/sentry-python/discussions/3936) or [on Discord](https://discord.gg/wdNEHETs87): How did the migration go? Did you encounter any issues? Is everything working as expected?
+Version 3.0 of the Sentry Python SDK is currently in pre-release. If you feel like giving it a spin, check out [our most recent releases](https://pypi.org/project/sentry-sdk/#history). Your feedback at this stage is invaluable, so please let us know about your experience, whether positive or negative, [on GitHub](https://github.com/getsentry/sentry-python/discussions/3936) or [on Discord](https://discord.com/invite/Ww9hbqr): How did the migration go? Did you encounter any issues? Is everything working as expected?
 
 </Alert>