docs: revert recent docs changes making gtag a window global

docs/forwarding-events.md

@@ -28,18 +28,6 @@ However, since GTM and Facebook Pixel were actually loaded in the web worker, th
 
 Notice the forward configs are just strings, not actual objects. We're using strings here so we can easily serialize what service variable was called, along with the function argument values. When the web worker receives the information, it then knows how to correctly apply the call and arguments that were fired from the main thread.
 
-If your script declares global functions or variables, make sure they are explicitly declared with `window` and forwarded to the web worker. This example shows the gtag function from Google Tag Manager. Note `window.gtag = function gtag()` instead of `function gtag()`.
-
-```html
-<script>
-    window.dataLayer = window.dataLayer || [];
-    window.gtag = function gtag(){dataLayer.push(arguments);}
-    gtag('js', new Date());
-
-    gtag('config', 'YOUR-ID-HERE');
-</script>
-```
-
 You can customize each forwarded variable with the following settings:
 
 - ### preserveBehavior

docs/google-tag-manager.md

@@ -14,7 +14,7 @@ Set the script element's `type` attribute to `text/partytown`. For example:
   <script type="text/partytown" src="https://www.googletagmanager.com/gtag/js?id=YOUR-ID-HERE"></script>
   <script type="text/partytown">
     window.dataLayer = window.dataLayer || [];
-    window.gtag = function gtag(){dataLayer.push(arguments);}
+    function gtag(){dataLayer.push(arguments);}
     gtag('js', new Date());
 
     gtag('config', 'YOUR-ID-HERE');

docs/sveltekit.md

@@ -48,11 +48,7 @@ Adapting from [the HTML integration guide](https://partytown.qwik.dev/html)
 
 ## 3. Then add 3rd party scripts
 
-This is where we use partytown to add those scripts (note `type="text/partytown"` below). If your script declares global functions or variables, make sure they are explicitly declared with `window` and forwarded to the web worker.
-
-This example shows Google Tag Manager. Note `window.gtag = function()` instead of `function gtag()`.
-
-Putting it together with the previous changes, our `+layout.svelte` looks like:
+This is where we use partytown to add those scripts (note `type="text/partytown"` below). This example shows Google Tag Manager. Putting it together with the previous changes, our `+layout.svelte` looks like:
 
 ```svelte
 // src/routes/+layout.svelte
@@ -67,7 +63,7 @@ Putting it together with the previous changes, our `+layout.svelte` looks like:
 	<script>
 		// Forward the necessary functions to the web worker layer
 		partytown = {
-			forward: ['dataLayer.push', 'gtag']
+			forward: ['dataLayer.push']
 		};
 	</script>
 
@@ -76,7 +72,7 @@ Putting it together with the previous changes, our `+layout.svelte` looks like:
 	<script type="text/partytown" src="https://www.googletagmanager.com/gtag/js?id=YOUR-ID-HERE"></script>
 	<script type="text/partytown">
 		window.dataLayer = window.dataLayer || [];
-		window.gtag = function(){dataLayer.push(arguments);}
+		function gtag(){dataLayer.push(arguments);}
 		gtag('js', new Date());
 		gtag('config', 'YOUR-ID-HERE');
 	</script>