Fix typos in asset_pipeline.md

guides/source/asset_pipeline.md

@@ -45,7 +45,7 @@ gem 'coffee-rails'
 ```
 
 Using the `--skip-sprockets` option will prevent Rails 4 from adding
-`sass-rails` and `uglifier` to Gemfile, so if you later want to enable
+`sass-rails` and `uglifier` to your Gemfile, so if you later want to enable
 the asset pipeline you will have to add those gems to your Gemfile. Also,
 creating an application with the `--skip-sprockets` option will generate
 a slightly different `config/application.rb` file, with a require statement
@@ -66,7 +66,7 @@ config.assets.js_compressor = :uglifier
 ```
 
 NOTE: The `sass-rails` gem is automatically used for CSS compression if included
-in Gemfile and no `config.assets.css_compressor` option is set.
+in the Gemfile and no `config.assets.css_compressor` option is set.
 
 
 ### Main Features
@@ -1300,7 +1300,7 @@ Rails 4 no longer sets default config values for Sprockets in `test.rb`, so
 environment are: `config.assets.compile = true`, `config.assets.compress = false`,
 `config.assets.debug = false` and `config.assets.digest = false`.
 
-The following should also be added to `Gemfile`:
+The following should also be added to your `Gemfile`:
 
 ```ruby
 gem 'sass-rails',   "~> 3.2.3"