docs: Update text in Sharing code tutorial (sveltejs#401)

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Co-authored-by: Simon H <[email protected]>

Author: pedroldk

content/tutorial/02-advanced-svelte/10-module-context/01-sharing-code/README.md

@@ -6,7 +6,7 @@ In all the examples we've seen so far, the `<script>` block contains code that r
 
 Very occasionally, you'll need to run some code outside of an individual component instance. For example: returning to our custom audio player from a [previous exercise](media-elements), you can play all five tracks simultaneously. It would be better if playing one stopped all the others.
 
-We can do that by declaring a `<script context="module">` block. Code contained inside it will run once, when the module first evaluates, rather than when a component is instantiated. Place this at the top of `AudioPlayer.svelte`:
+We can do that by declaring a `<script context="module">` block. Code contained inside it will run once, when the module first evaluates, rather than when a component is instantiated. Place this at the top of `AudioPlayer.svelte` (note that this is a _separate_ script tag):
 
 ```svelte
 /// file: AudioPlayer.svelte