Fix in documentation (#5612)
Fix in documentation (#5612)

- typo in serialization document: 'intead' => 'instead'
kgeorgy/django-rest-framework,tomchristie/django-rest-framework,jpadilla/django-rest-framework,jpadilla/django-rest-framework,kgeorgy/django-rest-framework,kgeorgy/django-rest-framework,tomchristie/django-rest-framework,tomchristie/django-rest-framework,jpadilla/django-rest-framework