Update docs-onboarding-checklist.md

Co-authored-by: Fran Méndez <[email protected]>

docs/onboarding-guide/docs-onboarding-checklist.md

@@ -18,5 +18,5 @@ Complete in order the following onboarding tasks:
 - [ ] Read all docs under the following content buckets: `Concepts`, `Tutorials`, `Reference`. (Take the time to go through each tutorial.)
 - [ ] Set up your local environment following our instructions for the [AsyncAPI git workflow](https://github.com/asyncapi/community/blob/master/git-workflow.md).
 - [ ] Introduce yourself in AsyncAPI Slack in the `#01_introductions` channel and the `#13_docs` channel. Ask docs-related questions in #13_docs.
-- [ ] Request a good first docs issue in the [`#13_docs` Slack channel](https://join.slack.com/share/enQtNjUxMTY4MzEzNTk4Ny0wYTU3OGI1MmM1YzQxMDY0OGUxY2JhZThkOGMwNDg4YjUzNjYwYjg5YTU0YzdiZjFhOGFkZjhlNmRkOTVlOTBj).
+- [ ] Request a good first docs issue in the [`#13_docs` Slack channel](https://asyncapi.com/slack-invite).
 - [ ] Attend [OPEN docs meetings](https://www.asyncapi.com/community/events) to chat with other maintainers, ask docs questions, and request help on docs blockers.