Documented the App and its AppOptions types in the app target.

App/Sources/App.swift

@@ -1,14 +1,17 @@
 import ArgumentParser
 import DoxyLibrary
 
+/// A command type that runs the service based on given of set of option parameters.
 @main struct Doxy: AsyncParsableCommand {
     
     // MARK: Properties
     
+    /// An option type that contains all the possible parameters that can be provided to the service.
     @OptionGroup var options: Options
     
     // MARK: Functions
     
+    /// Runs the service.
     mutating func run() async throws {
         let appBuilder = AppBuilder(
             name: options.name,

App/Sources/Options/AppOptions.swift

@@ -3,34 +3,40 @@ import DoxyLibrary
 import Logging
 
 extension Doxy {
+    /// An option type that contains all the possible parameters that can be provided to the application.
     struct Options: AppArguments, ParsableArguments {
 
         // MARK: Properties
 
+        /// A path to the location of the DocC archives in the local file system.
         @Option(
             name: .shortAndLong,
-            help: "A path to the location of the DocC archives in the local file system."
+            help: "A path to the location of the DocC archives in the local file system. Defaults to `Resources/Archives`."
         )
         var archivesPath: String = "Resources/Archives"
 
+        /// A hostname to bind the application to.
         @Option(
             name: .shortAndLong,
             help: "A hostname to bind the application to. Defaults to `127.0.0.1`."
         )
         var hostname: String = "127.0.0.1"
         
+        /// A log level to set the logger service in the application.
         @Option(
             name: .shortAndLong,
             help: "A log level to set the logger service in the application."
         )
         var logLevel: Logger.Level?
 
+        /// A name for the Hummingbird application.
         @Option(
             name: .shortAndLong,
-            help: "A name for the Hummingbird application."
+            help: "A name for the Hummingbird application. Defaults to `Doxy`."
         )
         var name: String = "Doxy"
 
+        /// A port number to bind the application to.
         @Option(
             name: .shortAndLong,
             help: "A port number to bind the application to. Defaults to `8080`."