docs: add instructions for Cumulocity IoT custom domains #2970
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Proposed changes
Add instructions for Cumulocity IoT users which are using the custom domain feature.
Add both instructions to a dedicated section (which is easier to link to), and add the error message in the "common errors" section.
Types of changes
Paste Link to the issue
Checklist
cargo fmt
as mentioned in CODING_GUIDELINEScargo clippy
as mentioned in CODING_GUIDELINESFurther comments