Add note to cache restore order

doc/ci/yaml/README.md

@@ -166,7 +166,12 @@ which can be set in GitLab's UI.
 ### cache
-> Introduced in GitLab Runner v0.7.0.
+
+>
+**Notes:**
+- Introduced in GitLab Runner v0.7.0.
+- Prior to v9.2.0. caches were restored after artifacts.
+- From v9.2.0. caches are restored before artifacts.
 `cache` is used to specify a list of files and directories which should be
 cached between jobs. You can only use paths that are within the project