chore(bidi): update docs to be explicit about only looking at elements within Angular (#10076)

crisbeto · jelbourn · commit 5d7c340e49fd · 2018-02-26T16:06:56.000-08:00
diff --git a/guides/bidirectionality.md b/guides/bidirectionality.md
@@ -3,30 +3,30 @@
 ### Setting a text-direction for your application
 The [`dir` attribute](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/dir)
 is typically applied to `<html>` or `<body>` element of a page. However, it can be used on any
-element to apply a text-direction to a smaller subset of the page.
+element, within your Angular app, to apply a text-direction to a smaller subset of the page.
 
 All Angular Material components automatically reflect the LTR/RTL direction
-of their container. 
+of their container.
 
 ### Reading the text-direction in your own components
 `@angular/cdk/bidi` provides a `Directionality` injectable that can be used by any component
-in your application. To consume this injectable, you must import `BidiModule`
-from `@angular/cdk/bidi`.
+in your application. To consume it, you must import `BidiModule` from `@angular/cdk/bidi`.
 
 `Directionality` provides two useful properties:
 * `value`: the current text direction, either `'ltr'` or `'rtl'`.
 * `change`: an `Observable` that emits whenever the text-direction changes. Note that this only
 captures changes from `dir` attributes _inside the Angular application context_. It will not
-emit for changes to `dir` on `<html>` and `<body>`, as these are assumed to be static.
+emit for changes to `dir` on `<html>` and `<body>`, as they are assumed to be static.
 
 #### Example
 ```ts
-@Component({ /* ... */})
+@Component({ /* ... */ })
 export class MyCustomComponent {
   private dir: Direction;
 
   constructor(directionality: Directionality) {
     this.dir = directionality.value;
+
     directionality.change.subscribe(() => {
        this.dir = directionality.value;
     });
