Improve E2E tests README for readability (#27884)

e2e-tests/playwright/README.md

@@ -8,7 +8,7 @@ cd server && make run
 
 # Or build and distribute webapp including channels and playbooks
 # so that their product URLs do not rely on Webpack dev server.
-# Especially important when running test inside the Playwright's docker container.
+# Especially important when running tests inside the Playwright's docker container.
 cd webapp && make dist
 cd server && make run-server
 ```
@@ -25,24 +25,24 @@ npm i
 # See https://playwright.dev/docs/browsers
 npx playwright install
 
-# Run specific test of all projects -- chrome, firefox, iphone and ipad.
+# Run a specific test of all projects -- Chrome, Firefox, iPhone and iPad.
 # See https://playwright.dev/docs/test-cli.
 npm run test -- login
 
-# Run specific test of a project
+# Run a specific test of a project
 npm run test -- login --project=chrome
 
 # Or run all tests
 npm run test
 ```
 
-#### 3. Inspect test results at `/test-results` folder when something failed unexpectedly.
+#### 3. Inspect test results at `/test-results` folder when something fails unexpectedly.
 
-## Updating screenshots is strictly via Playwright's docker container for consistency
+## Updating screenshots is done strictly via Playwright's docker container for consistency
 
 #### 1. Run docker container using latest focal version
 
-Change to root directory, run docker container
+Change to the root directory, then run the docker container.
 
 ```
 docker run -it --rm -v "$(pwd):/mattermost/" --ipc=host mcr.microsoft.com/playwright:v1.46.1 /bin/bash
@@ -73,4 +73,4 @@ npm run test -- login --update-snapshots
 
 See https://playwright.dev/docs/test-pom.
 
-Page and component abstractions are located at `./support/ui`. It should be first class before writing a spec file so that any future change in DOM structure will be done in one place only. No static UI text and fixed locator should be written in the spec file.
+Page and component abstractions are located at `./support/ui`. They should be established before writing a spec file so that any future changes in the DOM structure will be made in one place only. No static UI text or fixed locator should be written in the spec file.