Fix typo in configuration.rst

Author: EnTeQuAk

docs/configuration.rst

@@ -44,7 +44,7 @@ Configuration
 
 - **REST_SESSION_LOGIN** - Enable session login in Login API view (default: True)
 
-- **REST_USE_JWT** - Enable JWT Authentication instead of Token/Session based. This is built on top of django-rest-framework-jwt http://getblimp.github.io/django-rest-framework-jwt/ , which much also be installed. (default: False)
+- **REST_USE_JWT** - Enable JWT Authentication instead of Token/Session based. This is built on top of django-rest-framework-jwt http://getblimp.github.io/django-rest-framework-jwt/, which must also be installed. (default: False)
 
 - **OLD_PASSWORD_FIELD_ENABLED** - set it to True if you want to have old password verification on password change enpoint (default: False)