Improve explanation of on-call participants creation
What does this MR do?
Addresses a minor fix for #323875 (comment 525195923).
The color corresponding to a participant's shifts in an on-call schedule is saved with the participant and can be set via the API. The frontend sets these values when saving a new on-call schedule.
The expected colors for the frontend are https://design.gitlab.com/data-visualization/color/#categorical-data, but the backend accepts more weights than the frontend can render. If an improper weight is used in the API, it will show up as white in the UI.
This is an edge case for sure, so we're limiting the solution to documenting the caveat for the graphql endpoint for the time being, as this really isn't a priority. The feature is still behind a feature flag.
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