PL sub menu not available initially

The menu in step 2 will not be visible if a Synthetics monitor has not yet been created. This is a common source of confusion.

src/content/docs/synthetics/synthetic-monitoring/private-locations/private-locations-overview-monitor-internal-sites-add-new-locations.mdx

@@ -96,6 +96,9 @@ Before [installing private minions](/docs/synthetics/new-relic-synthetics/privat
 1. Ensure you meet the [requirements](#requirements), including activating the feature [by contacting your account representative](#compatibility-account-rep).
 2. Go to [**one.newrelic.com**](http://one.newrelic.com/) **> Synthetics > Private locations**. Then select <Icon name="fe-plus-circle"/>
    **Create private location**.
+
+    *Note: The Private locations sub menu becomes available after creating your first monitor.*
+
 3. Type a location name.
 4. Optional: Configure these additional settings: