Fix link to model_dump_json() (#8851)

docs/concepts/json_schema.md

@@ -1207,7 +1207,7 @@ print(validation_schema)
 ## Customizing the `$ref`s in JSON Schema
 
 The format of `$ref`s can be altered by calling [`model_json_schema()`][pydantic.main.BaseModel.model_json_schema]
-or `model_dump_json()`][pydantic.main.BaseModel.model_dump_json] with the `ref_template` keyword argument.
+or [`model_dump_json()`][pydantic.main.BaseModel.model_dump_json] with the `ref_template` keyword argument.
 The definitions are always stored under the key `$defs`, but a specified prefix can be used for the references.
 
 This is useful if you need to extend or modify the JSON schema default definitions location. For example, with OpenAPI: