fix doc typos

railties/lib/rails/plugin.rb

@@ -99,10 +99,9 @@ module Rails
   end
 
   # This Plugin subclass represents a Gem plugin. Although RubyGems has already
-  # taken care of $LOAD_PATH's, it have to expose its load_path's to add them
+  # taken care of $LOAD_PATHs, it exposes its load_paths to add them
   # to Dependencies.load_paths.
   class GemPlugin < Plugin
-
     # Initialize this plugin from a Gem::Specification.
     def initialize(spec)
       super(File.join(spec.full_gem_path))