Update README.md
What does this MR do?
The CI_REF_SLUG variable keeps underscores (_) intact when replacing, this is mentioned differently in the docs. The better thing would be to change the behavior to match the current docs (unfortunately App Engine Apps don't allow _ but only - in the URLs for some reason).
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
Edited by Valentin Funk