Update src/content/community/Community-Resources.md

Improvement from Benjie, fixing links that were confusing.

Signed-off-by: Brian Warner <[email protected]>

Co-authored-by: Benjie Gillam <[email protected]>

Author: brianwarner

src/content/community/Community-Resources.md

@@ -19,7 +19,7 @@ Please follow these channels for updates and information:
 
 * **Twitter:** [@graphql](https://twitter.com/graphql)
 * **GitHub:** [github.com/graphql](https://github.com/graphql)
-* **Slack:** [slack.graphql.org](https://slack-invite.graphql.org)
+* **Slack:** [slack.graphql.org](https://slack.graphql.org) ([get an invite](https://slack-invite.graphql.org))
 * **Google Calendar:** [calendar.graphql.org](https://calendar.graphql.org)
 * **Blog:** [graphql.org/blog](/blog/)