Update gitlab.yml example file
What does this MR do and why?
Updates gitlab.yml.example file
Updates examples for theme ID and color mode ID to reflect the actual default values.
Default values can be found here:
- Theme ID: 3 (Reference https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/themes.rb?ref_type=heads#L10)
- Color Mode ID: 3 (Reference https://gitlab.com/gitlab-org/gitlab/-/blob/d0b339e8b5336a384a1aa4e7e46853aad74067e0/lib/gitlab/color_modes.rb#L8)
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How to set up and validate locally
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Related to #548836 (closed)
Edited by Sascha Eggenberger