Update 1-usage.md

Fix typo.

documentation/3-complex-field/1-usage.md

@@ -9,7 +9,7 @@ Field::make('complex', 'crb_slide')->add_fields(array(
 ))
 ```
 
-The example above shows how to make a slide show. We crated a single complex field named `slide`, to which we attached one group of fields that represents a single slide – `title` and `photo`. The user will be able to add multiple rows of title and photo, thus creating a list of slides for the slide show.
+The example above shows how to make a slide show. We created a single complex field named `slide`, to which we attached one group of fields that represents a single slide – `title` and `photo`. The user will be able to add multiple rows of title and photo, thus creating a list of slides for the slide show.
 
 A more advanced usage of the complex field is shown below:
 
@@ -28,4 +28,4 @@ Field::make('complex', 'crb_media_item')
 
 Here we have to create a list of media items, lets say for an art exhibition. There are two types of items – photos (defined by an `image` and a `caption`) and movies (having a `title`, `length` and the `video` file itself). Since items have different properties, we need to define separate group for each one. Groups also must have a name, by which they will be recognized later – `photograph` and `movie`.
 
-As you can see, depending on their usage, complex fields can either contain a single unnamed group or multiple named groups.
+As you can see, depending on their usage, complex fields can either contain a single unnamed group or multiple named groups.