chore: Fix path in e2e test readme (#13094)

Before submitting a pull request, please take a look at our

[Contributing](https://github.com/getsentry/sentry-javascript/blob/master/CONTRIBUTING.md)
guidelines and verify:

- [ ] If you've added code that should be tested, please add tests.
- [ ] Ensure your code lints and the test suite passes (`yarn lint`) &
(`yarn test`).

dev-packages/e2e-tests/README.md

@@ -43,7 +43,7 @@ Test applications are completely standalone applications that can be used to ver
 these commands:
 
 ```sh
-cd packages/e2e-tests
+cd dev-packages/e2e-tests
 
 # Create a new test application folder
 mkdir test-applications/my-new-test-application # Name of the new folder doesn't technically matter but choose something meaningful