docs: Correct repo name usage
Change reference from "runtime repo" to "main repo" in unit test advice
document.
@@ -275,7 +275,7 @@ Some repositories already provide utility functions to skip a test:
### running Golang tests as a different user
-The runtime repository has the most comprehensive set of skip abilities. See:
+The main repository has the most comprehensive set of skip abilities. See:
- https://github.com/kata-containers/kata-containers/tree/main/src/runtime/pkg/katatestutils
