Fix Playwright support/index.js comments and remove Cypress references

Updated header comments to reference Playwright instead of Cypress:
- Changed references from "Cypress" to "Playwright"
- Updated documentation link to Playwright test fixtures docs
- Removed commented-out Cypress-specific import
- Updated comment to reference './on-rails' instead of './commands'

These comments were carried over from the cypress-on-rails template
but should reflect Playwright usage.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

spec/dummy/e2e/playwright/support/index.js

@@ -3,19 +3,17 @@
 // loaded automatically before your test files.
 //
 // This is a great place to put global configuration and
-// behavior that modifies Cypress.
+// behavior that modifies Playwright.
 //
-// You can change the location of this file or turn off
-// automatically serving support files with the
-// 'supportFile' configuration option.
+// This file is automatically loaded before test execution
+// to set up global hooks, fixtures, and helper functions.
 //
 // You can read more here:
-// https://on.cypress.io/configuration
+// https://playwright.dev/docs/test-fixtures
 // ***********************************************************
 
-// Import commands.js using ES2015 syntax:
+// Import Playwright-Rails helper functions:
 import './on-rails';
-// import 'cypress-on-rails/support/index'
 
 // Alternatively you can use CommonJS syntax:
-// require('./commands')
+// require('./on-rails')