docs(guide/bootstrap): fix typo

Closes angular#4578

Author: arty-name

docs/content/guide/bootstrap.ngdoc

@@ -114,7 +114,7 @@ This is the sequence that your code should follow:
 
 ## Deferred Bootstrap
 
-This features enables tools like Batarang and test runners to
+This feature enables tools like Batarang and test runners to
 hook into angular's bootstrap process and sneak in more modules
 into the DI registry which can replace or augment DI services for
 the purpose of instrumentation or mocking out heavy dependencies.
@@ -125,4 +125,4 @@ 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.