feat(crons): Add CLI environment check-in docs (#7504)

src/docs/product/crons/getting-started/cli.mdx

@@ -61,7 +61,8 @@ sentry-cli monitors run my-monitor-slug -- node path/to/file.js
 
 ### Specifying Monitor Environments (Optional)
 
-<Alert level="info">
-  The `sentry-cli` doesn't currently support the ability to specify monitor
-  environment for check-ins.
-</Alert>
+If your cron monitor runs in multiple environments you can use the `-e` flag to specify which [Monitor Environment](/product/crons/job-monitoring/#multiple-environments) to send check-ins to.
+
+```bash {tabTitle: Node.JS}
+sentry-cli monitors run -e dev my-monitor-slug -- node path/to/file.js
+```