ci: update reference docs (#8867)

Co-authored-by: sarah11918 <sarah11918@users.noreply.github.com>

src/content/docs/en/reference/configuration-reference.mdx

@@ -1702,7 +1702,7 @@ import Avatar from '~/components/Avatar.astro';
 <Avatar server:defer />
 ```
 
-The outer page will be rendered, either at build-time (`hybrid`) or at runtime (`server`) with the island content omitted and a `<script>` tag included in its place.
+The outer page will be rendered, either at build time (`hybrid`) or at runtime (`server`) with the island content omitted and a `<script>` tag included in its place.
 
 After the page loads in the browser, the script tag will replace itself with the the contents of the island by making a request.
 
@@ -1721,7 +1721,7 @@ const user = await getUser(Astro.locals.userId);
 
 Since your component will not render with the rest of the page, you may want to add generic content (e.g. a loading message) to temporarily show in its place. This content will be displayed when the page first renders but before the island has loaded.
 
-Add placeholder content as a child of your Astro component with the `slot="fallback:` attribute. When your island content is available, the fallback content will be replaced.
+Add placeholder content as a child of your Astro component with the `slot="fallback"` attribute. When your island content is available, the fallback content will be replaced.
 
 The example below displays a generic avatar as fallback content, then animates into a personalized avatar using view transitions: