Update Generate.java (#6515)

Removed missed -D messages

modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/Generate.java

@@ -230,7 +230,7 @@ public class Generate extends OpenApiGeneratorCommand {
     @Option(name = {"--log-to-stderr"},
             title = "Log to STDERR",
             description = "write all log messages (not just errors) to STDOUT."
-                    + " Useful for piping the JSON output of debug options (e.g. `-DdebugOperations`) to an external parser directly while testing a generator.")
+                    + " Useful for piping the JSON output of debug options (e.g. `--global-property debugOperations`) to an external parser directly while testing a generator.")
     private Boolean logToStderr;
 
     @Option(name = {"--enable-post-process-file"}, title = "enable post-process file", description = CodegenConstants.ENABLE_POST_PROCESS_FILE_DESC)
@@ -407,7 +407,6 @@ public void execute() {
         }
 
         if (globalProperties != null && !globalProperties.isEmpty()) {
-            System.err.println("[DEPRECATED] -D arguments after 'generate' are application arguments and not Java System Properties, please consider changing to --global-property, apply your system properties to JAVA_OPTS, or move the -D arguments before the jar option.");
             applyGlobalPropertiesKvpList(globalProperties, configurator);
         }
         applyInstantiationTypesKvpList(instantiationTypes, configurator);