Add links, remove confusing sentence

Author: ralfhandl

versions/3.1.1.md

@@ -2788,15 +2788,12 @@ The OpenAPI Specification allows combining and extending model definitions using
 `allOf` takes an array of object definitions that are validated *independently* but together compose a single object.
 
 While composition offers model extensibility, it does not imply a hierarchy between the models.
-To support polymorphism, the OpenAPI Specification adds the `discriminator` field.
+To support polymorphism, the OpenAPI Specification adds the [`discriminator`](#schemaDiscriminator) field.
 When used, the `discriminator` indicates the name of the property that hints which schema definition is expected to validate the structure of the model.
-<!-- 3.0.4 contains the following text: does it also apply to 3.1.1?
 As such, the `discriminator` field MUST be a required field.
 There are two ways to define the value of a discriminator for an inheriting instance.
 - Use the schema name.
-- Override the schema name by overriding the property with a new value. If a new value exists, this takes precedence over the schema name.
-As such, inline schema definitions, which do not have a given id, *cannot* be used in polymorphism.
--->
+- [Override the schema name](#discriminatorMapping) by overriding the property with a new value. If a new value exists, this takes precedence over the schema name.
 
 ###### Generic (Template) Data Structures