Update serializers documentation (removed feature)

It seems that allow_add_remove was removed from 3.x, yet the docs still mention it. Updating to avoid confusion.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/api-guide/serializers.md b/docs/api-guide/serializers.md
index 2adea513..2f13bd2a 100644
--- a/docs/api-guide/serializers.md
+++ b/docs/api-guide/serializers.md
@@ -478,7 +478,7 @@ The default `ModelSerializer` uses primary keys for relationships, but you can a
 
 The `depth` option should be set to an integer value that indicates the depth of relationships that should be traversed before reverting to a flat representation.
 
-If you want to customize the way the serialization is done (e.g. using `allow_add_remove`) you'll need to define the field yourself.
+If you want to customize the way the serialization is done you'll need to define the field yourself.
 
 ## Specifying fields explicitly