docs: Small devtools docs fixes (#3255)

Replace this text.

packages/flame_devtools/README.md

@@ -42,7 +42,7 @@ from the devtools extension. Don't forget to add the new connector to the
 list of connectors in the `DevToolsService` class.
 
 If you want to run with the devtools extension with the simulated mode for
-faster development, you can use `melos devtools-simulate` to start the
+faster development, you can use `melos devtools-simulator` to start the
 simulated environment and run the devtools extension in the browser.
 Remember that you have to manually enter the Dart VM Service Connection URI
 in the simulated devtools environment.