Update docs to show how to make report artifact downloadble

doc/user/project/merge_requests/code_quality.md

@@ -66,6 +66,18 @@ will scan your source code for code quality issues. The report will be saved as
 that you can later download and analyze. Due to implementation limitations we always
 take the latest Code Quality artifact available.
 
+By default, report artifacts are not downloadable. If you need them downloadable on the
+job details page, you can add `gl-code-quality-report.json` to the artifact paths like so:
+
+```yaml
+include:
+  - template: Code-Quality.gitlab-ci.yml
+
+code_quality:
+  artifacts:
+    paths: [gl-code-quality-report.json]
+```
+
 The included `code_quality` job is running in the `test` stage, so it needs to be included in your CI config, like so:
 
 ```yaml