Fix Linux System module and add documentation.

Author: ioquatix

lib/localhost/system.rb

@@ -4,7 +4,9 @@
 # Copyright, 2025, by Samuel Williams.
 
 module Localhost
+	# @namespace
 	module System
+		# @return [Class] The  best system class for the current platform.
 		def self.current
 			case RUBY_PLATFORM
 			when /darwin/

lib/localhost/system/darwin.rb

@@ -5,7 +5,11 @@
 
 module Localhost
 	module System
+		# Darwin specific system operations.
 		module Darwin
+			# Install a certificate into the system trust store.
+			#
+			# @parameter certificate [String] The path to the certificate file.
 			def self.install(certificate)
 				login_keychain = File.expand_path("~/Library/Keychains/login.keychain-db")
 

lib/localhost/system/linux.rb

@@ -3,11 +3,13 @@
 # Released under the MIT License.
 # Copyright, 2025, by Samuel Williams.
 
-require "etc"
-
 module Localhost
 	module System
-		module Darwin
+		# Linux specific system operations.
+		module Linux
+			# Install a certificate into the system trust store.
+			#
+			# @parameter certificate [String] The path to the certificate file.
 			def self.install(certificate)
 				filename = File.basename(certificate)
 				destination = "/usr/local/share/ca-certificates/localhost-#{filename}"