chore(core): fix wording

packages/nx/src/migrations/update-18-0-0/disable-crystal-for-existing-workspaces.ts

@@ -8,7 +8,7 @@ export default function migrate(tree: Tree) {
     ig.add(tree.read('.gitignore', 'utf-8'));
     if (ig.ignores('.env')) {
       logger.warn(
-        'NX The NX_ADD_PLUGINS=false environment variable was added to your .env file for backwards compatibility. However, your .env is ignored by git. Other contributors should add this key to their .env file or ensure that the environment variable is true when generating code with Nx.'
+        'NX The NX_ADD_PLUGINS=false environment variable was added to your .env file for backwards compatibility. However, your .env is ignored by git. Other contributors should add this key to their .env file or ensure that the environment variable is set to false when generating code with Nx.'
       );
     }
   } catch {}