fixes link for Horologist (#1056)

ComposeStarter/README.md

@@ -8,11 +8,10 @@ Introduction
 Simple "Hello, World" app meant as a starting point for a new project using
 Compose for Wear OS.
 
-Displays a centered [Text] composable and a list built with [Horologist]
-(https://github.com/google/horologist).
+Displays a centered [Text] composable and a list built with [Horologist][horologist].
 
 For more information on composable options in Compose for Wear OS, check out our
-[documentation](https://developer.android.com/reference/kotlin/androidx/wear/compose/material/package-summary.html).
+[documentation][documentation].
 
 Screenshots
 -----------
@@ -50,6 +49,8 @@ If you've found an error in this sample, please [create an issue](https://github
 Patches are encouraged, and may be submitted by forking this project and
 submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
 
+[documentation]: https://developer.android.com/reference/kotlin/androidx/wear/compose/material/package-summary.html
+[horologist]: https://github.com/google/horologist
 [droidcon-talk]: https://www.droidcon.com/2023/11/15/easy-screenshot-testing-with-compose/
 [wear-device]: https://github.com/android/wear-os-samples/blob/main/ComposeStarter/app/src/test/java/presentation/WearDevice.kt
 [wear-preview-font-scales]: https://developer.android.com/reference/kotlin/androidx/wear/compose/ui/tooling/preview/WearPreviewFontScales