docs: Correct browser support sentences for Playwright and Cypress (#2865)

* docs: Correct browser language for Playwright and Cypress

I was going through the testing section in preparation for teaching my Vitest workshop @ VueConf and noticed outdated information about browser support WRT Playwright + Cypress.

* typo

Author: JessicaSachs

src/guide/scaling-up/testing.md

@@ -263,13 +263,13 @@ When end-to-end (E2E) tests are run in continuous integration/deployment pipelin
 
 - [Cypress](https://www.cypress.io/)
 
-  Overall, we believe Cypress provides the most complete E2E solution with features like an informative graphical interface, excellent debuggability, built-in assertions and stubs, flake-resistance, parallelization, and snapshots. As mentioned above, it also provides support for [Component Testing](https://docs.cypress.io/guides/component-testing/introduction). However, it only supports Chromium-based browsers and Firefox.
+  Overall, we believe Cypress provides the most complete E2E solution with features like an informative graphical interface, excellent debuggability, built-in assertions, stubs, flake-resistance, parallelization, and snapshots. As mentioned above, it also provides support for [Component Testing](https://docs.cypress.io/guides/component-testing/introduction). It supports Chromium-based browsers, Firefox, and Electron. WebKit support is available, but marked experimental.
 
 ### Other Options {#other-options-2}
 
-- [Playwright](https://playwright.dev/) is also a great E2E testing solution with a wider range of browser support (mainly WebKit). See [Why Playwright](https://playwright.dev/docs/why-playwright) for more details.
+- [Playwright](https://playwright.dev/) is also a great E2E testing solution. WebKit is supported by Playwright, but Electron is marked experimental. See [Why Playwright](https://playwright.dev/docs/why-playwright) for more details.
 
-- [Nightwatch](https://nightwatchjs.org/) is an E2E testing solution based on [Selenium WebDriver](https://www.npmjs.com/package/selenium-webdriver). This gives it the widest browser support range.
+- [Nightwatch](https://nightwatchjs.org/) is an E2E testing solution based on [Selenium WebDriver](https://www.npmjs.com/package/selenium-webdriver). This gives it the widest browser support range, including native mobile testing. Selenium-based solutions will be slower than Playwright or Cypress.
 
 - [WebdriverIO](https://webdriver.io/) is a test automation framework for web and mobile testing based on the WebDriver protocol.