Command examples in core/tests/README.md are confusing and not executable

Problem/Motivation

There are many helpful commands in the core/tests/README.md, like

brew install selenium-server-standalone
brew install chromedriver

and

export MINK_DRIVER_ARGS_WEBDRIVER='["chrome", null, "http://localhost:4444/wd/hub"]'
./vendor/bin/phpunit -c core --testsuite functional-javascript

Additionally, 90% of the command examples re-include the ./vendor/bin/phpunit part.
At first glance, it's not clear if that's on the same line as the needed command (it's not) or if it is required to run alongside the export commands (it's not).
And as it does not include trailing semicolons, pasting the block will not work

Proposed resolution

Add trailing semicolons to commands that should be run together and are on different lines
Consider removing the redundant ./vendor/bin/phpunit portions from the set-up commands.

Remaining tasks

N/A

User interface changes

N/A

API changes

N/A

Data model changes

N/A