Fix template

.github/pull_request_template.md

@@ -24,4 +24,4 @@
 - [ ] tested locally and on preview environment (preview dev login: 5de6)
 - [ ] updated [test cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md) document
 - [ ] added tests
-- [ ] if any new env variables are added, added them to `.env.example` and the `builder/env-check.js` if mandatory
+- [ ] if any new env variables are added, added them to `.env` file