Improper script in example on 'Keyword reference for the .gitlab-ci.yml file' page
## Description
There is a simple mistake in the second example of the _Complete example for release_ section on _Keyword reference for the .gitlab-ci.yml file_ page.
Link to that section: https://docs.gitlab.com/ee/ci/yaml/#complete-example-for-release
The script within release_job:
```
script:
- echo 'running release_job for $TAG'
```
uses apostrophe while having a variable referenced inside and due to that the variable will not be resolved properly.
Using quotation marks is required for that purpose (and it is properly used in the rest of the examples).
issue