SwiftDocCProblemStructureProblemA problem with a document along with possible solutions to the problem.struct ProblemTopicsInitializersinit(diagnostic: Diagnostic)init(diagnostic: Diagnostic, possibleSolutions: some Sequence<Solution>)Instance Propertiesvar diagnostic: DiagnosticA diagnostic describing the problem.var possibleSolutions: [Solution]The possible solutions to the problem if there are any.