SwiftDocCDocumentationContextDocumentationContext.ConfigurationDocumentationContext.Configuration.ExternalDocumentationConfigurationStructureDocumentationContext.Configuration.ExternalDocumentationConfigurationA collection of configuration related to external sources of documentation.struct ExternalDocumentationConfigurationTopicsInstance Propertiesvar globalSymbolResolver: (any GlobalExternalSymbolResolver)?A type that resolves all symbols that are referenced in symbol graph files but can’t be found in any of the locally available symbol graph files.var sources: [DocumentationBundle.Identifier : any ExternalDocumentationSource]The lookup of external documentation sources by their bundle identifiers.