Update overview.mdx (#3)

Author: lorenzolewis

docs/src/content/docs/demo/overview.mdx

@@ -89,7 +89,7 @@ import { Steps } from '@astrojs/starlight/components'
 
 1. #### Change the sorting order of the `changelog` directory
 
-   By default, content in in autogenerated sidebar groups is sorted by user-specific [order](https://starlight.astro.build/reference/frontmatter/#order) defined in a frontmatter field or alphabetically by slug.
+   By default, content in an autogenerated sidebar groups is sorted by a user-specified [order](https://starlight.astro.build/reference/frontmatter/#order) defined in a frontmatter field or alphabetically by slug.
    For a directory containing release notes, it might be useful to reverse the sorting order so that the latest release notes are displayed first.
 
    To change the sorting order of the `changelog` directory, a [metadata file](/metadata/) located in the `src/content/docs/reference/changelog/` directory is used.