Fix typo in doc comment for NavigatorItem.init?(rawValue:) (#1340)

It should be either "Parameters:" (plural) with a nested list of named parameters, or "Parameter x:" (singular).

Author: ole

Sources/SwiftDocC/Indexing/Navigator/NavigatorItem.swift

@@ -112,7 +112,7 @@ public final class NavigatorItem: Serializable, Codable, Equatable, CustomString
     /**
      Initialize a `NavigatorItem` using raw data.
 
-     - Parameters rawValue: The `Data` from which the instance should be deserialized from.
+     - Parameter rawValue: The `Data` from which the instance should be deserialized from.
      */
     required public init?(rawValue: Data) {
         let data = rawValue