private slack channels are also supported (#27481)

Author: vjfridge

content/en/dashboards/sharing/scheduled_reports.md

@@ -19,7 +19,7 @@ Scheduled reports enable Datadog users to share dashboards as high-density PDFs
 
 {{< img src="dashboards/scheduled_reports/report_pdf.png" alt="Example report PDF attachment" style="width:90%;" >}}
 
-The report PDF can be sent to public Slack channels or email addresses.
+The report PDF can be sent to Slack channels or email addresses.
 
 {{< img src="dashboards/scheduled_reports/report_slack.png" alt="Example report slack with PDF report linked" style="width:90%;" >}}
 
@@ -65,7 +65,7 @@ To see the report before saving the schedule, click **Send Test Email**. You can
 
 #### Slack recipients
 
-To add Slack recipients, select the Slack workspace and channel from the available dropdowns. If you do not see any Slack workspaces available, ensure you have the Datadog [Slack Integration][8] installed. To send a test message to Slack, add a channel recipient and click **Send Test Message**.
+To add Slack recipients, select the Slack workspace and channel from the available dropdowns. If you do not see any Slack workspaces available, ensure you have the Datadog [Slack Integration][8] installed. All public channels within the Slack workspace should be listed automatically. To select a private Slack channel, make sure to invite the Datadog Slack bot to the channel in Slack. To send a test message to Slack, add a channel recipient and click **Send Test Message**.
 
 **{{< img src="dashboards/scheduled_reports/add_slack_recipients.png" alt="The configuration modal for editing scheduled report email recipients." style="width:90%;" >}}**