Align anchor with defaultMapping field name

Author: handrews

src/oas.md

@@ -2882,7 +2882,7 @@ Note that `discriminator` MUST NOT change the validation outcome of the schema.
 | ---- | :----: | ---- |
 | <a name="property-name"></a>propertyName | `string` | **REQUIRED**. The name of the discriminating property in the payload that will hold the discriminating value. The discriminating property MAY be defined as required or optional, but when defined as optional the Discriminator Object MUST include a `defaultMapping` field that specifies which schema is expected to validate the structure of the model when the discriminating property is not present. |
 | <a name="discriminator-mapping"></a> mapping | Map[`string`, `string`] | An object to hold mappings between payload values and schema names or URI references. |
-| <a name="default"></a> defaultMapping | `string` | The schema name or URI reference to a schema that is expected to validate the structure of the model when the discriminating property is not present in the payload or contains a value for which there is no explicit or implicit mapping. |
+| <a name="discriminator-default-mapping"></a> defaultMapping | `string` | The schema name or URI reference to a schema that is expected to validate the structure of the model when the discriminating property is not present in the payload or contains a value for which there is no explicit or implicit mapping. |
 
 This object MAY be extended with [Specification Extensions](#specification-extensions).