Add clearer placeholders and channel definition for Mattermost and Slack notifications services
What does this MR do?
Add clearer placeholders and channel definition for Mattermost and Slack notifications services
Screenshots (if relevant)
| Mattermost | Slack |
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Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated - Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
Does not close, just fixes partially: