docs(guide/*): spelling/grammar improvements

Closes #10552

Author: gokulkrishh

docs/content/guide/bootstrap.ngdoc

@@ -88,7 +88,7 @@ As a best practice, consider adding an `ng-strict-di` directive on the same elem
 ```
 
 This will ensure that all services in your application are properly annotated.
-See the {@link guide/di#using-strict-dependency-injection dependancy injection strict mode} docs
+See the {@link guide/di#using-strict-dependency-injection dependency injection strict mode} docs
 for more.
 
 
@@ -156,4 +156,4 @@ until `angular.resumeBootstrap()` is called.
 
 `angular.resumeBootstrap()` takes an optional array of modules that
 should be added to the original list of modules that the app was
-about to be bootstrapped with.
+about to be bootstrapped with.

docs/content/guide/migration.ngdoc

@@ -21,7 +21,7 @@ which drives many of these changes.
 
 You can no longer invoke .bind, .call or .apply on a function in angular expressions.
 This is to disallow changing the behaviour of existing functions
-in an unforseen fashion.
+in an unforeseen fashion.
 
   - due to [6081f207](https://github.com/angular/angular.js/commit/6081f20769e64a800ee8075c168412b21f026d99),
 
@@ -877,7 +877,7 @@ of `$sce.trustAsHtml(string)`. When bound to a plain string, the string is sanit
 module is not loaded) and the bound expression evaluates to a value that is not trusted an
 exception is thrown.
 
-When using this directive you can either include `ngSanitize` in your module's dependencis (See the
+When using this directive you can either include `ngSanitize` in your module's dependencies (See the
 example at the {@link ngBindHtml} reference) or use the {@link $sce} service to set the value as
 trusted.
 
@@ -1134,10 +1134,10 @@ freely available to JavaScript code (as before).
 
 Angular expressions execute in a limited context. They do not have
 direct access to the global scope, `window`, `document` or the Function
-constructor. However, they have direct access to names/properties on
-the scope chain. It has been a long standing best practice to keep
+constructor. However, they have direct access to names/properties on
+the scope chain. It has been a long standing best practice to keep
 sensitive APIs outside of the scope chain (in a closure or your
-controller.) That's easier said that done for two reasons:
+controller.) That's easier said than done for two reasons:
 
 1. JavaScript does not have a notion of private properties so if you need
 someone on the scope chain for JavaScript use, you also expose it to