add doc about remove operation id prefix

Author: yuhaibohotmail

docs/modules/ROOT/pages/includes/getting-started.adoc

@@ -88,6 +88,13 @@ quarkus.openapi-generator.codegen.spec.petstore_json.model-name-suffix=CustomMod
 quarkus.openapi-generator.codegen.spec.petstore_json.model-name-prefix=CustomModelPrefix
 ----
 
+You can customize the name of generated method. To do that, you must define the following properties:
+
+[source,properties]
+----
+quarkus.openapi-generator.codegen.spec.petstore_json.remove-operation-id-prefix=true
+----
+
 The same way you can add any additional annotations to the generated api files with `additional-api-type-annotations`. Given you want to include Foo and Bar annotations, you must define additional-api-type-annotations as:
 
 [source,properties]