fix: Broken image (#5406)

Author: untitaker

src/docs/product/integrations/notification-incidents/slack/index.mdx

@@ -34,7 +34,7 @@ Slack defaults to let any workspace member authorize apps, but they may have to
 
 Your integration details page will refresh and show the Slack workspace you just added.
 
-    ![Installation success message](slack-install-success.png)
+![Installation success message](slack-install-success.png)
 
 Your Slack integration is now available to all projects in your Sentry organization. To enable Slack notification for private channels, add the Slack app to the channel. One quick method: use `@sentry` to invite the Sentry bot the Slack channel.