GA4 SDK requires page() to initialize.md

Add a note about page being required to load GA4 SDK.

Author: prigiattiperrut

src/connections/destinations/catalog/actions-google-analytics-4-web/index.md

@@ -27,6 +27,7 @@ To connect the Google Analytics 4 Web destination:
 4. Select the web source that will send data to Google Analytics 4 and follow the steps to name your destination. The web source chosen must use [Analytics.js 2.0](/docs/connections/sources/catalog/libraries/website/javascript/){:target='_blank'}.
 5. On the **Settings** tab, under **Basic Settings**, enter in the [Measurement ID](https://support.google.com/analytics/answer/9539598){:target='_blank'} associated with your GA4 web stream.
 6. Set up your event mappings by following the steps in the Destinations Actions documentation on [Customizing mappings](/docs/connections/destinations/actions/#customizing-mappings).
+7. Analytics.js requires an initial Page call to send data to Google Analytics 4 Web. The [Segment snippet](https://segment.com/docs/connections/sources/catalog/libraries/website/javascript/quickstart/#step-2-add-the-segment-snippet) includes this initial call by default.
 
 After you've set up at least one event in your **Mappings** tab, you can see your events and parameters using the Google [Realtime](https://support.google.com/analytics/answer/9271392){:target="_blank"} and [DebugView](https://support.google.com/analytics/answer/7201382){:target="_blank"} reports. These two reports show you the events users trigger on your website as they occur. The DebugView report requires additional configuration before you can use it.