improve Alpine install docs

docs/installation.md

@@ -69,8 +69,11 @@ You can find the `rpm` repository [here](https://gitsecret.jfrog.io/artifactory/
 
 ### Alpine
 
-You can find the `apk` repository [here](https://gitsecret.jfrog.io/artifactory/git-secret-apk/).
-See list of supported architectures [here](https://github.com/sobolevn/git-secret/blob/master/utils/apk/meta.sh)
+`apk` is a packaging system for Alpine.
+You can find the `apk` `git-secret` packaging 
+[here](https://gitsecret.jfrog.io/artifactory/git-secret-apk/),
+and you can see a list of supported architectures 
+[here](https://github.com/sobolevn/git-secret/blob/master/utils/apk/meta.sh)
 
 ```bash
 {% include install-apk.sh %}