Clarify orphaned coverage

Signed-off-by: Zhiwei Liang <zhiwei.liang@zliang.me>

Author: ChihweiLHBird

modules/openapi-generator/src/main/java/org/openapitools/codegen/utils/ModelUtils.java

@@ -1113,7 +1113,7 @@ public static List<Schema> getAllSchemasInDocument(OpenAPI openAPI) {
             }
         });
 
-        // Also visit component schemas not reachable from any path (orphaned schemas)
+        // Also visit components/schemas entries not reachable from any path
         List<String> refSchemas = new ArrayList<String>();
         getSchemas(openAPI).forEach((key, schema) -> {
             visitSchema(openAPI, schema, null, refSchemas, (s, mimeType) -> {
@@ -1164,7 +1164,7 @@ public static RequestBody getRequestBody(OpenAPI openAPI, String name) {
      */
     public static ApiResponse getReferencedApiResponse(OpenAPI openAPI, ApiResponse apiResponse) {
         if (apiResponse != null && StringUtils.isNotEmpty(apiResponse.get$ref())) {
-            String name = getSimpleRef(apiResponse.get$ref());
+            String name = getSimpleRef(apiResponse.get$ref(schemas));
             ApiResponse referencedApiResponse = getApiResponse(openAPI, name);
             if (referencedApiResponse != null) {
                 return referencedApiResponse;