docs: fix 'Slack' spelling (#5529)

Author: alexandear

Diff for: docs/src/docs/index.mdx

@@ -15,7 +15,7 @@ import { IconContainer } from "lib/icons";
 It runs linters in parallel, uses caching, supports YAML configuration,
 integrates with all major IDEs, and includes over a hundred linters.
 
-Join our slack <IconContainer color="#1DA1F2"><FaSlack /></IconContainer> channel by [joining Gophers workspace](https://invite.slack.golangbridge.org/)
+Join our Slack <IconContainer color="#1DA1F2"><FaSlack /></IconContainer> channel by [joining Gophers workspace](https://invite.slack.golangbridge.org/)
 and then [joining](https://gophers.slack.com/archives/CS0TBRKPC) channel [`#golangci-lint`](https://gophers.slack.com/archives/CS0TBRKPC).
 
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