Align documentation of occurences of designator
The `designator` element is applied as a child of many other elements, with different documentation strings. The wiki is only able to show one documentation string, but the different variations can be read in the UML, the generated XSDs or the schema documentation.
To ensure the correct understanding and use of designators, the documentation should be aligned for all occurrences. As the wiki can only pick one, they should ideally be identical.
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