In the structure definition (http://hl7.org/fhir/2018May/terminologycapabilities.html#resource) I suggest to avoid to use aliases for the descriptions of operations:

expansion - - > Information about the - $expansion - * ValueSet/$expand * operation

validateCode - - > Information about the - $validation - * ValuseSet/$validate-code * operation

translation - - > Information about the * $translation * * ConceptMap/$translate * operation

closure - - > Information about the * ConceptMap/ *$closure operation