docs: tweak tutorial (#879)

clarified the code slightly by providing file names where the changes apply for context and an example of the last use

Author: laelhalawani

apps/svelte.dev/content/tutorial/01-svelte/03-props/03-spread-props/index.md

@@ -2,7 +2,7 @@
 title: Spread props
 ---
 
-In this exercise, we've forgotten to pass the `name` prop expected by `PackageInfo.svelte`, meaning the `<code>` element is empty and the npm link is broken.
+In this exercise, in `App.svelte` we've forgotten to pass the `name` prop expected by `PackageInfo.svelte`, meaning the `<code>` element is empty and the npm link is broken.
 
 We _could_ fix it by adding the prop...
 
@@ -23,7 +23,7 @@ We _could_ fix it by adding the prop...
 <PackageInfo +++{...pkg}+++ />
 ```
 
-> [!NOTE] Conversely, you can get an object containing all the props that were passed into a component using a rest property...
+> [!NOTE] Conversely, in `PackageInfo.svelte` you can get an object containing all the props that were passed into a component using a rest property...
 >
 > ```js
 > let { name, ...stuff } = $props();
@@ -34,3 +34,9 @@ We _could_ fix it by adding the prop...
 > ```js
 > let stuff = $props();
 > ```
+>
+> ...in which case you can access the properties by their object paths:
+>
+> ```js
+> console.log(stuff.name, stuff.version, stuff.description, stuff.website)
+> ```