docs: add quotes to clarify what site title is in example (#25669)

docs/1.getting-started/5.seo-meta.md

@@ -190,7 +190,7 @@ If you want to use a function (for full control), then this cannot be set in you
 
 ::
 
-Now, if you set the title to `My Page` with [`useHead`](/docs/api/composables/use-head) on another page of your site, the title would appear as 'My Page - Site Title' in the browser tab. You could also pass `null` to default to the site title.
+Now, if you set the title to `My Page` with [`useHead`](/docs/api/composables/use-head) on another page of your site, the title would appear as 'My Page - Site Title' in the browser tab. You could also pass `null` to default to 'Site Title'.
 
 ### Body Tags