Merge branch 'fix-incorrect-syntax-artifacts-untracked' into 'master'

Docs: fix syntax error in `artifacts:untracked` example

See merge request gitlab-org/gitlab!41180

doc/ci/yaml/README.md

@@ -3221,7 +3221,7 @@ Send all untracked files but [exclude](#artifactsexclude) `*.txt`:
 artifacts:
   untracked: true
   exclude:
-    - *.txt
+    - "*.txt"
 ```
 
 #### `artifacts:when`