Update documentation

Author: jonnyholland

Sources/ComposableArchitecturePattern/ServerAPIError.swift

@@ -7,13 +7,15 @@
 
 import Foundation
 
+/// An error encountered during server operation.
 public enum ServerAPIError: Error {
 	/// The API request is bad.
 	case badRequest(description: String? = nil, error: Error? = nil)
 	/// The API unexpectedly returned empty data.
 	case emptyData(description: String? = nil)
 	/// The wrong data returned in response.
 	case incorrectReponseData(description: String? = nil)
+	/// A local error.
 	case local(description: String? = nil, error: Error? = nil)
 	/// An error occurred with the network.
 	case network(description: String? = nil)

Sources/ComposableArchitecturePattern/ServerEnvironment.swift

@@ -7,10 +7,15 @@
 
 import Foundation
 
+/// A server environment with url path.
 public enum ServerEnvironment: Hashable, CustomStringConvertible {
+	/// A development environment.
 	case development(url: String)
+	/// A local environment.
 	case local(url: String)
+	/// A production environment.
 	case production(url: String)
+	/// A test environment.
 	case test(url: String)
 
 	public var description: String {
@@ -23,6 +28,7 @@ public enum ServerEnvironment: Hashable, CustomStringConvertible {
 		}
 	}
 
+	/// A url from the environment path.
 	public var url: URL? {
 		switch self {
 			case let .development(url),