XML Scheme improvements (breaking changes)

Check coverageIntervalMUType in listUnivariateUncertainty
Typo in realInListType: measurementUncertaintyUnivariate (correction breaking change)
Typo listsignificantDigit (correction breaking change)
Improve inline documentation to make clear which elements are deprecated.
Fix inline documentation where abbrivated names are used
Update and verify XML examples!

Edited Aug 12, 2025 by Daniel Hutzschenreuter

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