address wording feedback

doc/development/fe_guide/performance.md

@@ -51,18 +51,18 @@ properties once, and handle the actual animation with transforms.
 
 Code that is contained within `main.js` and `commons/index.js` are loaded and
 run on _all_ pages. **DO NOT ADD** anything to these files unless it is truly
-needed _everywhere_. This includes ubiquitous libraries like `vue`, `axios`,
-and `jQuery`, as well as code for the main navigation and sidebar. Where
-possible we should aim to remove modules from these bundles to reduce our code
-footprint.
+needed _everywhere_. These bundles include ubiquitous libraries like `vue`,
+`axios`, and `jQuery`, as well as code for the main navigation and sidebar.
+Where possible we should aim to remove modules from these bundles to reduce our
+code footprint.
 
 ### Page-specific JavaScript
 
 Webpack has been configured to automatically generate entry point bundles based
 on the file structure within `app/assets/javascripts/pages/*`. The directories
-within the `pages` directory are meant to correspond to Rails controllers and
-actions. These auto-generated bundles will be automatically included on the
-corresponding pages.
+within the `pages` directory correspond to Rails controllers and actions. These
+auto-generated bundles will be automatically included on the corresponding
+pages.
 
 For example, if you were to visit [gitlab.com/gitlab-org/gitlab-ce/issues](https://gitlab.com/gitlab-org/gitlab-ce/issues),
 you would be accessing the `app/controllers/projects/issues_controller.rb`
@@ -82,8 +82,8 @@ In addition to these page-specific bundles, the code within `main.js` and
 
 - **Identifying Controller Paths:**
   If you are unsure what controller and action corresponds to a given page, you
-  can find this out by checking `document.body.dataset.page` while on any page
-  within gitlab.com.
+  can find this out by inspecting `document.body.dataset.page` within your
+  browser's developer console while on any page within gitlab.
 
 - **Keep Entry Points Lite:**
   Page-specific javascript entry points should be as lite as possible.  These