Remove invalid installtion content because there is no corresponding files
@@ -41,7 +41,7 @@ each `docker` command with `sudo`. To avoid having to use `sudo` with the
`docker` and add users to it.
For more information about installing Docker or `sudo` configuration, refer to
-the [installation](../../installation/index.md) instructions for your operating system.
+the [installation](https://docs.docker.com/engine/installation/) instructions for your operating system.
## Environment variables
